Monday, May 23, 2016
India's mini space shuttle blasts off
India successfully launched its first model space shuttle on Monday, a top official said, as New Delhi joined the race to develop a reusable rocket to make space travel easier and cheaper.
The winged shuttle blasted off on a rocket from the southeastern spaceport of Sriharikota at about 7:00am (0130 GMT), with television footage showing it streaming through a clear sky.
The shuttle, about one sixth the size of a normal one, was meant to reach an altitude of 70 kilometres (43 miles) before gliding back down and splashing into the Bay of Bengal 10 minutes later.
"The lift-off was at 7am from the first launch pad here," India's space chief Devi Prasad Karnik told AFP.
"We have successfully accomplished the RLV mission as a technology demonstrator," he said.
The Indian Space Research Organisation (ISRO), known for its low costs, has developed the winged shuttle called the Reusable Launch Vehicle or RLV-TD reportedly on a miniscule budget of one billion rupees ($14 million).
Monday's test mission was a crucial step towards eventually developing a full-scale, reusable shuttle to send up satellites in the future.
India faces stiff competition including from global companies which are developing their own reusable rockets after NASA retired its space shuttle programme in 2011.
Reusable rockets would cut costs and waste in the space industry, which currently loses millions of dollars in jettisoned machinery after each launch.
Billionaire Elon Musk's SpaceX and Amazon owner Jeff Bezos's Blue Origin have already successfully undertaken their own test launches.
But ISRO hopes to develop its own frugal shuttle, as it seeks to cash in on a huge and lucrative demand from other countries to send up their satellites.
ISRO made global headlines in 2013 after it successfully launched an unmanned mission to orbit Mars, spending just $73 million. NASA had spent $671 million on its Maven Mars mission.
Monday, January 18, 2016
The Demon Haunted World By Carl Sagan (Rating ***)
The Demon-Haunted World is a collection of twenty-five essays, several written with Sagan's wife, Ann Druyan. The essays range in scope from eloquent paeans to science to impassioned denunciations of bigotry, from humorous accounts of a variety of pseudoscientific endeavors to serious attempts to understand the nature of alien abduction delusions. With intelligence and wit, and the rational calmness that is his trademark, Sagan takes on a wide variety of topics, among them: alien abductions, astrology, Atlantis, the Bell Curve, channeling, crop circles, demons, electromagnetism, ESP, the face on Mars, fairies, faith healing, magic, miracles, prayer, religion, Roswell, satanic rituals, therapy, and, of course, one of his favorite topics, UFOs and extraterrestrials. Only Velikovsky gets ignored this time around. Through each of his essays he extols the virtues of skepticism, empirical evidence and control studies, while uncovering a multitude of errors and weaknesses in the positions of occultists, paranormalists, supernaturalists and pseudoscientists. And he does so with extreme grace, gentility and civility.
In fact, if there is anything I disagree with in Sagan's book it is probably his encouragement of skeptics to be as civil as he is in dealing with what skeptics see as the dark that extinguishes the candle. He writes
"...the chief deficiency I see in the skeptical movement is in its polarization: US vs. Them--the sense that we have a monopoly on the truth; that those other people who believe in all these stupid doctrines are morons; that if you're sensible, you'll listen to us; and if not, you're beyond redemption. This is unconstructive....whereas a compassionate approach that from the beginning acknowledges the human roots of pseudoscience and superstition might be much more widely accepted."
"If we understand this, then of course we feel the uncertainty and pain of the abductees, or those who dare not leave home without consulting their horoscopes....such compassion for kindred spirits in a common quest also works to make science and the scientific method less off-putting, especially to the young."
"Many pseudoscientific and New Age belief systems emerge out of dissatisfaction with conventional values and perspectives--and are therefore themselves a kind of skepticism."
I can't deny that there is a strong appeal in this call for compassion, for seeing the occultists of the world as after the same thing skeptics are after, and for recognizing the skepticism in those who adhere to pseudoscientific or New Age spiritual notions. If the goal were to try to get the true believer to give up his or her beliefs, then I would agree that an aggressive campaign which arrogantly maintains that it is better to live according to evidence than according to wishes might not be the best tactic. But, the aggressive, blunt, seemingly arrogant approach might be best if the goal is not to convert true believers to skepticism but to provide ideas which will counterbalance the plethora of occult, pseudoscientific, supernatural and paranormal notions which pervade just about any atmosphere in America, or the world, for that matter.
These aggressive methods may be the best ones if the goal is not to help persons who have been encouraged by therapists to think they've been experimented on by aliens, but rather to deter present and future therapists from encouraging patients to accept such beliefs as true and from using hypnosis to recover repressed memories. Such methods can evoke false memories of terrible things which probably never occurred. There is little to be gained, I think, in being compassionate with therapists who have no regard for truth and who encourage their patients to remember childhood abuses regardless of whether the abuses happened or not. Therapists who care for the truth are more likely to get aroused and make some effort to halt the abuses of their colleagues if we make a loud enough noise. And perhaps a future patient of one of these abusive therapists will have heard our angry voices and remember what we've said and question the therapist's methods.
Blunt and direct methods may be called for if the goal is not to persuade someone to give up astrology, crystals or tarot cards, but rather is to try to prevent someone in the future from seriously considering such things as reasonable guides to life.
I agree that it is unconstructive to be dogmatic, to call other people 'morons' or their ideas 'stupid.' I also agree that compassion is the appropriate response for people who have been duped by deluded therapists into believing incredible and harmful things. But I don't think it is the appropriate response to the therapists. We should go after them, and go after them aggressively with the bluntest instruments our language can muster. Likewise for the purveyors of pseudoscientific and New Age rubbish. To the L. Ron Hubbards, Helen Schucmans, Aleister Crowleys, John Macks, Budd Hopkins and Wade Quattlebaums of the world I say show no mercy!
Although some skeptics may take issue with Sagan's genteel style and grandpaternal tone, none of us will find fault with his skilful and recurring emphasis on critical thinking. The more blunt and vulgar among us refer to the need for a crap detector; Sagan provides instruction for building one's "baloney detection kit." He covers several common fallacies and ways to avoid them. He emphasizes the need for skepticism in critical thinking and the necessity for verification and corroboration of claims before accepting them. And he returns again and again to the role of the mass media in forming our characters and opinions. He is especially concerned with the fact that more and more mass media operations are coming into the possession of fewer and fewer individuals or groups. The potential for abuse of power is obvious but, as Orwell said, we have to keep pointing out the obvious. Sagan is hopeful that the internet will be an antidote for this concentration of control over information. So am I.
Another favorite theme of Sagan's is the need for scientists to be communicators, to use the media and the classroom to explain to the masses the truths and beauties of science, instilling in them the sense of wonder which drives people like himself. His criticisms of typical science instruction in America and the paucity of science writers for popular markets are right on target and worth studied perusal by science educators.
It is easy to recommend a book so reflective of one's own views, especially views which are skeptical of belief in God and an afterlife. It is even easier to recommend a book which, even though it covers topics and ideas the reader has gone over a thousand times, does so in a style which makes them seem fresh, is rarely dull, and quite frequently stimulates the reader to want to think about these issues more deeply and wonder if there isn't more he could be doing to make this world a better, saner, more rational place for our children and grandchildren.
Carl Sagan died on December 20, 1996, and it now seems apparent that A Candle in the Dark was meant to be his epitaph. Nothing could be more fitting, for if anyone has been light in these Dark Ages, it was Carl Sagan. But he was more like one of Velikovsky's comets, showering the earth with gifts as he passed through.
In fact, if there is anything I disagree with in Sagan's book it is probably his encouragement of skeptics to be as civil as he is in dealing with what skeptics see as the dark that extinguishes the candle. He writes
"...the chief deficiency I see in the skeptical movement is in its polarization: US vs. Them--the sense that we have a monopoly on the truth; that those other people who believe in all these stupid doctrines are morons; that if you're sensible, you'll listen to us; and if not, you're beyond redemption. This is unconstructive....whereas a compassionate approach that from the beginning acknowledges the human roots of pseudoscience and superstition might be much more widely accepted."
"If we understand this, then of course we feel the uncertainty and pain of the abductees, or those who dare not leave home without consulting their horoscopes....such compassion for kindred spirits in a common quest also works to make science and the scientific method less off-putting, especially to the young."
"Many pseudoscientific and New Age belief systems emerge out of dissatisfaction with conventional values and perspectives--and are therefore themselves a kind of skepticism."
I can't deny that there is a strong appeal in this call for compassion, for seeing the occultists of the world as after the same thing skeptics are after, and for recognizing the skepticism in those who adhere to pseudoscientific or New Age spiritual notions. If the goal were to try to get the true believer to give up his or her beliefs, then I would agree that an aggressive campaign which arrogantly maintains that it is better to live according to evidence than according to wishes might not be the best tactic. But, the aggressive, blunt, seemingly arrogant approach might be best if the goal is not to convert true believers to skepticism but to provide ideas which will counterbalance the plethora of occult, pseudoscientific, supernatural and paranormal notions which pervade just about any atmosphere in America, or the world, for that matter.
These aggressive methods may be the best ones if the goal is not to help persons who have been encouraged by therapists to think they've been experimented on by aliens, but rather to deter present and future therapists from encouraging patients to accept such beliefs as true and from using hypnosis to recover repressed memories. Such methods can evoke false memories of terrible things which probably never occurred. There is little to be gained, I think, in being compassionate with therapists who have no regard for truth and who encourage their patients to remember childhood abuses regardless of whether the abuses happened or not. Therapists who care for the truth are more likely to get aroused and make some effort to halt the abuses of their colleagues if we make a loud enough noise. And perhaps a future patient of one of these abusive therapists will have heard our angry voices and remember what we've said and question the therapist's methods.
Blunt and direct methods may be called for if the goal is not to persuade someone to give up astrology, crystals or tarot cards, but rather is to try to prevent someone in the future from seriously considering such things as reasonable guides to life.
I agree that it is unconstructive to be dogmatic, to call other people 'morons' or their ideas 'stupid.' I also agree that compassion is the appropriate response for people who have been duped by deluded therapists into believing incredible and harmful things. But I don't think it is the appropriate response to the therapists. We should go after them, and go after them aggressively with the bluntest instruments our language can muster. Likewise for the purveyors of pseudoscientific and New Age rubbish. To the L. Ron Hubbards, Helen Schucmans, Aleister Crowleys, John Macks, Budd Hopkins and Wade Quattlebaums of the world I say show no mercy!
Although some skeptics may take issue with Sagan's genteel style and grandpaternal tone, none of us will find fault with his skilful and recurring emphasis on critical thinking. The more blunt and vulgar among us refer to the need for a crap detector; Sagan provides instruction for building one's "baloney detection kit." He covers several common fallacies and ways to avoid them. He emphasizes the need for skepticism in critical thinking and the necessity for verification and corroboration of claims before accepting them. And he returns again and again to the role of the mass media in forming our characters and opinions. He is especially concerned with the fact that more and more mass media operations are coming into the possession of fewer and fewer individuals or groups. The potential for abuse of power is obvious but, as Orwell said, we have to keep pointing out the obvious. Sagan is hopeful that the internet will be an antidote for this concentration of control over information. So am I.
Another favorite theme of Sagan's is the need for scientists to be communicators, to use the media and the classroom to explain to the masses the truths and beauties of science, instilling in them the sense of wonder which drives people like himself. His criticisms of typical science instruction in America and the paucity of science writers for popular markets are right on target and worth studied perusal by science educators.
It is easy to recommend a book so reflective of one's own views, especially views which are skeptical of belief in God and an afterlife. It is even easier to recommend a book which, even though it covers topics and ideas the reader has gone over a thousand times, does so in a style which makes them seem fresh, is rarely dull, and quite frequently stimulates the reader to want to think about these issues more deeply and wonder if there isn't more he could be doing to make this world a better, saner, more rational place for our children and grandchildren.
Carl Sagan died on December 20, 1996, and it now seems apparent that A Candle in the Dark was meant to be his epitaph. Nothing could be more fitting, for if anyone has been light in these Dark Ages, it was Carl Sagan. But he was more like one of Velikovsky's comets, showering the earth with gifts as he passed through.
Sunday, October 4, 2015
Pluto's Big Moon Charon Reveals a Colorful and Violent History
At half the diameter of Pluto, Charon is the largest satellite relative to its planet in the solar system. Many New Horizons scientists expected Charon to be a monotonous, crater-battered world; instead, they're finding a landscape covered with mountains, canyons, landslides, surface-color variations and more.
"We thought the probability of seeing such interesting features on this satellite of a world at the far edge of our solar system was low," said Ross Beyer, an affiliate of the New Horizons Geology, Geophysics and Imaging (GGI) team from the SETI Institute and NASA Ames Research Center in Mountain View, California, "but I couldn't be more delighted with what we see!"
High-resolution images of the Pluto-facing hemisphere of Charon, taken by New Horizons as the spacecraft sped through the Pluto system on July 14, and transmitted to Earth on Sept. 21, reveal details of a belt of fractures and canyons just north of the moon's equator. This great canyon system stretches across the entire face of Charon, more than a thousand miles, and probably around onto Charon's far side. Four times as long as the Grand Canyon, and twice as deep in places, these faults and canyons indicate a titanic geological upheaval in Charon's past.
"It looks like the entire crust of Charon has been split open," said John Spencer, deputy lead for GGI at the Southwest Research Institute in Boulder, Colorado. "In respect to its size relative to Charon, this feature is much like the vast Valles Marineris canyon system on Mars."
The team has also discovered that the plains south of the canyon, informally referred to as Vulcan Planum, have fewer large craters than the regions to the north, indicating that they are noticeably younger. The smoothness of the plains, as well as their grooves and faint ridges, are clear signs of wide-scale resurfacing.
One possibility for the smooth surface is a kind of cold volcanic activity, called cryovolcanism. "The team is discussing the possibility that an internal water ocean could have frozen long ago, and the resulting volume change could have led to Charon cracking open, allowing water-based lavas to reach the surface at that time," said Paul Schenk, a New Horizons team member from the Lunar and Planetary Institute in Houston.
Even higher-resolution Charon images and composition data are still to come as New Horizons transmits data, stored on its digital recorders, over the next year - and as that happens, "I predict Charon's story will become even more amazing!" said mission Project Scientist Hal Weaver, of the Johns Hopkins University Applied Physics Laboratory in Laurel, Maryland.
The New Horizons spacecraft is currently 3.1 billion miles (5 billion kilometers) from Earth, with all systems healthy and operating normally.
New Horizons is part of NASA's New Frontiers Program, managed by the agency's Marshall Space Flight Center in Huntsville, Alabama. APL designed, built, and operates the New Horizons spacecraft and manages the mission for NASA's Science Mission Directorate. SwRI leads the science mission, payload operations, and encounter science planning.
Monday, September 28, 2015
Isro successfully launches Astrosat, six other satellites
SRIHARIKOTA: Isro on Monday successfully launched India's first astronomy satellite Astrosat, eleven years after the government cleared the project. A Polar Satellite Launch Vehicle (PSLV-C30) carrying Astrosat and six other satellites lifted off from the Satish Dhawan Space Centre in Sriharikota at 10am. In around 25 minutes after liftoff, PSLV-C30 injected Astrosat and other satellites -- four US nano satellites, a microsatellite from Indonesia a nanosatellite from Canada - into their respective orbits. This is the first time India is launching a US satellite.
Astrosat was placed in an orbit 644.651km from earth, as desired. The satellite achieved an expected inclination of 6.002 degree. "The mission is successful. It is a well-professed and synchronous efforts." Satish Dhawan Space Centre director P Kunhikrishnan said after the launch. "It's a hard earned gift," he added.
ASTROSAT
Astrosat, which had a lift-off mass of 1,513kg, will now embark on a five-year astronomy mission studying distant celestial objects. It will observe the universe in the optical, ultraviolet, low and high energy x-ray regions of the electromagnetic spectrum, compared to most other scientific satellites that are capable of observing a narrow range of wavelength band.
Among its assignments, the five payloads of Astrosat will study star birth regions and black holes. ISRO's website lists out the objective of the observatory: to understand high energy processes in binary star systems containing neutron stars and black holes, estimate magnetic fields of neutron stars, study star birth regions and high energy processes in star systems lying beyond our galaxy, detect new briefly bright x-ray sources in the sky and perform limited deep field survey of the universe in the ultraviolet region.
Carrying five payloads, Astrosat is capable of observing the sky in the visible, near ultraviolet (UV) and far UV regions of the electromagnetic spectrum. The two telescopes on the Ultraviolet Imaging Telescope (UVIT) payload are designed to achieve an excellent image resolution, while the other four payloads have their specific roles.
The other payloads are Large X-Ray Proportional Counter (LAXPC), Soft x-ray Telescope (SXT), Cadmium Zinc Telluride Imager (CZTI) and Charge Particle Monitor (CPM). The payloads will start working on next Monday, on the eighth day after launch.
FOREIGN PASSENGERS
The four LEMUR nanosatellites from Spire Global Inc, San Francisco (US), are non-visual remote sensing satellites focusing primarily on global maritime intelligence through vessel tracking via the Automatic Identification System (AIS), and high fidelity weather forecasting using GPS Radio Occultation technology.
Besides these, the PSLV-C30 also launched LAPAN-A2, a microsatellite from the National Institute of Aeronautics and Space-LAPAN, Indonesia, meant for providing maritime surveillance using Automatic Identification System (AIS), supporting Indonesian radio amateur communities for disaster mitigation and carrying out Earth surveillance using video and digital camera.
And the last foreign passenger is the NLS-14 (Ev9), a nanosatellite from Space Flight Laboratory, University of Toronto Institute for Advanced Studies (SFL, UTIAS), Canada. It is a maritime monitoring Nanosatellite using the next generation Automatic Identification System (AIS).
Astrosat was placed in an orbit 644.651km from earth, as desired. The satellite achieved an expected inclination of 6.002 degree. "The mission is successful. It is a well-professed and synchronous efforts." Satish Dhawan Space Centre director P Kunhikrishnan said after the launch. "It's a hard earned gift," he added.
ASTROSAT
Astrosat, which had a lift-off mass of 1,513kg, will now embark on a five-year astronomy mission studying distant celestial objects. It will observe the universe in the optical, ultraviolet, low and high energy x-ray regions of the electromagnetic spectrum, compared to most other scientific satellites that are capable of observing a narrow range of wavelength band.
Among its assignments, the five payloads of Astrosat will study star birth regions and black holes. ISRO's website lists out the objective of the observatory: to understand high energy processes in binary star systems containing neutron stars and black holes, estimate magnetic fields of neutron stars, study star birth regions and high energy processes in star systems lying beyond our galaxy, detect new briefly bright x-ray sources in the sky and perform limited deep field survey of the universe in the ultraviolet region.
Carrying five payloads, Astrosat is capable of observing the sky in the visible, near ultraviolet (UV) and far UV regions of the electromagnetic spectrum. The two telescopes on the Ultraviolet Imaging Telescope (UVIT) payload are designed to achieve an excellent image resolution, while the other four payloads have their specific roles.
The other payloads are Large X-Ray Proportional Counter (LAXPC), Soft x-ray Telescope (SXT), Cadmium Zinc Telluride Imager (CZTI) and Charge Particle Monitor (CPM). The payloads will start working on next Monday, on the eighth day after launch.
FOREIGN PASSENGERS
The four LEMUR nanosatellites from Spire Global Inc, San Francisco (US), are non-visual remote sensing satellites focusing primarily on global maritime intelligence through vessel tracking via the Automatic Identification System (AIS), and high fidelity weather forecasting using GPS Radio Occultation technology.
Besides these, the PSLV-C30 also launched LAPAN-A2, a microsatellite from the National Institute of Aeronautics and Space-LAPAN, Indonesia, meant for providing maritime surveillance using Automatic Identification System (AIS), supporting Indonesian radio amateur communities for disaster mitigation and carrying out Earth surveillance using video and digital camera.
And the last foreign passenger is the NLS-14 (Ev9), a nanosatellite from Space Flight Laboratory, University of Toronto Institute for Advanced Studies (SFL, UTIAS), Canada. It is a maritime monitoring Nanosatellite using the next generation Automatic Identification System (AIS).
Thursday, April 23, 2015
द व्हॅली ऑफ फिअर मुळ लेखक - ऑर्थर कॉनन डायल अनुवाद - प्रवीण जोशी (दर्जा ****)
"बर्याचदा सत्य कल्पनेपेक्षाही थरारक असतं!" - शेरलॉक होम्स. दैवजात तीक्ष्ण बुद्धी लाभलेल्या होम्ससमोर अत्यंत अवघड कोडं सोडवायला आलं; ज्याची पाळंमुळं अमेरिका आणि युरोप अशा दोन खंडांमध्ये रुजली होती. एका धाडसी माणसाचं आयुष्य भीतीने झाकोळून टाकणारी अक्राळविक्राळ दरी... 'द व्हॅली ऑफ फिअर".... ही शेरलॉक होम्सची खूप गाजलेली कादंबरी.
सर आर्थर कॉनन डॉयल यांचा मानसपुत्र शेरलॉक होम्स याच्या थरारक कारनाम्याची ही एक कादंबरी. ती इंग्रजीत खूप गाजली. तिचा हा मराठी अनुवाद. शेरलॉकच्या कादंबऱ्या ज्यांना वाचायला आवडतात, त्यांच्यासाठी हे पुस्तक आहे. त्याविषयी वेगळे काही सांगायची गरज नाही. या पुस्तकाला अनुवादकाने छोटेसे टिपण जोडले आहे. त्याला 'प्रस्तावना' असे नाव दिले असले तरी तो 'ऋणनिर्देश' आहे. प्रस्तावना म्हणण्याजोगे त्यात काहीही नाही. शिवाय अनुवादकाचा 'ऋणनिर्देश' हाही अशा प्रकारच्या पुस्तकासाठी उचित नाही. याशिवाय इन्प्रिंटच्याच पानावर अनुवादकाची अर्पणपत्रिकाही दिली आहे. तिचीही गरज नव्हती. अनुवाद मात्र चांगला उतरला आहे.
गेल्या पाच, सहा पिढ्यांना बुद्धीमान शेरलॉक होम्सच्या गाजलेल्या कादंबरीचा प्रवीण जोशी यांनी केलेला हा अनुवाद आहे. एखादे काल्पनिक पात्र आपल्याच जगातील वाटावे, एवढे जीवंत करण्याचे श्रेय त्याचा जनक सर आर्थर कॉनन डायलकडे जातं. डोक्यावर हॅट, ओठांमध्ये चिरूट, हातात काठी अशा वेशभूषेतील शेरलॉक होम्स "बऱ्याचदा सत्य कल्पनेपेक्षा थरारक असतं" असं सांगतो. अमेरिका आणि युरोपशी संबंधित या कथेत शेरलॉक होम्स त्याच्या तीक्ष्ण बुद्धीच्या साह्याने अत्यंत अवघड कोडे सोडवितो. भयाच्या, भीतीच्या या दरीत खोल बुडी मारून सत्य शोधून काढण्याच्या त्याच्या रोमांचकारी वाचकही सामील होतात.
शेरलॉक होम्स हे सर ऑर्थर कॉनन डॉयल यांच्या कादंबरीतील पात्र, त्यांचा मानसपुत्र. पेशाने डिटेक्टिव्ह असलेल्या शेरलॉक होम्सच्या कादंबऱ्यांनी वाचकांना खिळवून ठेवले. बर्लस्टन राजवाड्यात
झालेल्या डग्लसच्या खुनाचा तपास होम्स ज्या पद्धतीने लावतो, ते अगदी वाचताना मती गुंग होते. अगदी होम्समधील विविध गुणांची चुणूक दिसते. डिटेक्टिव्ह, हेरगिरीच्या कथा ज्यांना आवडतात, त्यांना ही कादंबरी खिळवून ठेवते.
सर आर्थर कॉनन डॉयल यांचा मानसपुत्र शेरलॉक होम्स याच्या थरारक कारनाम्याची ही एक कादंबरी. ती इंग्रजीत खूप गाजली. तिचा हा मराठी अनुवाद. शेरलॉकच्या कादंबऱ्या ज्यांना वाचायला आवडतात, त्यांच्यासाठी हे पुस्तक आहे. त्याविषयी वेगळे काही सांगायची गरज नाही. या पुस्तकाला अनुवादकाने छोटेसे टिपण जोडले आहे. त्याला 'प्रस्तावना' असे नाव दिले असले तरी तो 'ऋणनिर्देश' आहे. प्रस्तावना म्हणण्याजोगे त्यात काहीही नाही. शिवाय अनुवादकाचा 'ऋणनिर्देश' हाही अशा प्रकारच्या पुस्तकासाठी उचित नाही. याशिवाय इन्प्रिंटच्याच पानावर अनुवादकाची अर्पणपत्रिकाही दिली आहे. तिचीही गरज नव्हती. अनुवाद मात्र चांगला उतरला आहे.
गेल्या पाच, सहा पिढ्यांना बुद्धीमान शेरलॉक होम्सच्या गाजलेल्या कादंबरीचा प्रवीण जोशी यांनी केलेला हा अनुवाद आहे. एखादे काल्पनिक पात्र आपल्याच जगातील वाटावे, एवढे जीवंत करण्याचे श्रेय त्याचा जनक सर आर्थर कॉनन डायलकडे जातं. डोक्यावर हॅट, ओठांमध्ये चिरूट, हातात काठी अशा वेशभूषेतील शेरलॉक होम्स "बऱ्याचदा सत्य कल्पनेपेक्षा थरारक असतं" असं सांगतो. अमेरिका आणि युरोपशी संबंधित या कथेत शेरलॉक होम्स त्याच्या तीक्ष्ण बुद्धीच्या साह्याने अत्यंत अवघड कोडे सोडवितो. भयाच्या, भीतीच्या या दरीत खोल बुडी मारून सत्य शोधून काढण्याच्या त्याच्या रोमांचकारी वाचकही सामील होतात.
शेरलॉक होम्स हे सर ऑर्थर कॉनन डॉयल यांच्या कादंबरीतील पात्र, त्यांचा मानसपुत्र. पेशाने डिटेक्टिव्ह असलेल्या शेरलॉक होम्सच्या कादंबऱ्यांनी वाचकांना खिळवून ठेवले. बर्लस्टन राजवाड्यात
झालेल्या डग्लसच्या खुनाचा तपास होम्स ज्या पद्धतीने लावतो, ते अगदी वाचताना मती गुंग होते. अगदी होम्समधील विविध गुणांची चुणूक दिसते. डिटेक्टिव्ह, हेरगिरीच्या कथा ज्यांना आवडतात, त्यांना ही कादंबरी खिळवून ठेवते.
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