scientific american - 1997 03 - the rising seas - how much of a threat
scientific american - 1997 03 - the rising seas - how much of a threat
... WASTE ABC AJANSI Gamma Liaison JERRY ALEXANDER Tony Stone Images Copyright 1997 Scientific American, Inc. contaminants, but the fine-grained sed- iments that accumulate on the bottom of the sea ... the National Re- search Council has advised designers of the international space station to take extra precaution against a range of road hazards, including falling rocks, met...
Ngày tải lên: 12/05/2014, 15:21
scientific american - 1997 05 - the 100 - year weather forecast
... join the rest of the pride. If any of the other females have cubs, they form a crèche and remain in near-con- stant association for the next year and a half before breeding again. The moth- ers ... mystery News and Analysis18 Scientific American May 1997 Fowl Play You can’t judge a bird by its feathers. In a show of microsurgical mastery, Evan Balaban of the...
Ngày tải lên: 12/05/2014, 15:23
scientific american - 1997 06 - the microchip that rewires itself
... SEA AFGHANISTAN PAKISTAN UZBEKISTAN ARABIAN SEA GULF OF OMAN PERSIAN GULF UNITED ARAB EMIRATES QATAR OMAN SAUDI ARABIA OMAN IRAN IRANIAN NUCLEAR ESTABLISHMENT includes several research facilities in or near Tehran ... Vienna-based Interna- tional Atomic Energy Agency (IAEA). In the wake of the Persian Gulf War, when the world discovered that Iraq had sys- tematically deceived IAEA i...
Ngày tải lên: 12/05/2014, 15:26
scientific american - 1993 03 - black holes and the centrifugal force paradox
... its gravitational ra- dius. A black hole that has the same mass as the sun should have a gravita- tional radius of about three kilometers. If a light ray travels parallel to the sur- face of the ... work. Lasota and I realized that mo- tion along the path of a circular ray ap- pears to be so acutely paradoxical be- cause it is diÛcult to accept the fact that although...
Ngày tải lên: 12/05/2014, 14:49
scientific american - 1994 03 - visiting yourself in the past
... human-generated increas- es in carbon dioxide are negating a nat- ural global cooling or enhancing a glob- al warming. Either way, he says, the Þnd- ings Òwill not eradicate the importance of carbon ... photograph hanging in his oÛce. It shows a man climbing a ladder that leans against some vast, abstract structure. Like the ascending man, Wali says, Chandrasekhar is Òconstan...
Ngày tải lên: 12/05/2014, 14:54
scientific american - 1997 10 - special issue - the future of transportation
... fly- NORTH AMERICA LATIN AMERICA WESTERN EUROPE CENTRAL AND EASTERN EUROPE FORMER SOVIET UNION MIDDLE EAST AND NORTH AFRICA SUB-SAHARAN AFRICA CENTRALLY PLANNED ASIA SOUTH ASIA PACIFIC ASIA PACIFIC ... Institute Copyright 1997 Scientific American, Inc. at individuals. She was already doing that as a matter of temperament,” notes Sarah Blaffer Hrdy, an anthropologist at the Universit...
Ngày tải lên: 12/05/2014, 15:30
scientific american - 1997 12 - building the biggest
... mega- hertz. By analyzing the peaks and val- leys and how they change as the fre- quency rises, Sinha’s software calculates the density of the hidden material, the speed of sound through it and ... including the Appalachian Mountains, the Appalachian Plateau, the Piedmont and the coastal plain. Also, this region, unlike the North, did not suffer the devastating eff...
Ngày tải lên: 12/05/2014, 15:32
scientific american - 2001 03 - sculpting the earth from inside out
... circumvallate papilla—and details of human taste buds. (The circumvallate papilla and the taste bud are shown as both dia- grams and micrographs.) Only the circumvallate, foliate and fungiform papillae ... meeting of the American Astronomical Society and the American Association of Physics Teachers, Danielson point- ed out that for medieval and Renaissance Europeans, the...
Ngày tải lên: 12/05/2014, 16:08
scientific american - 1993 01 - the turbulent birth of the milky way
... their advantage. If you take the practical ra- ther than the idealistic approach, you save a lot of headaches.ÓÑPaul Wallich 24 SCIENTIFIC AMERICAN January 1993 hen a greasy burger or a handful of salted ... historical accounts of the slave trade to ex- plain the difference. The cause of death for most slaves was diarrhea, and the sweating, vomiting and lack of...
Ngày tải lên: 12/05/2014, 14:48
scientific american - 1994 04 - the dilemmas of prostate cancer
... words, the nuclear wea- pons remain nonlethal. The chairman of the con- ference was John B. Alexan- der, who heads the nonle- thal defense program at Los Alamos National Laboratory and has been called ... electron-hole pairs as well as electron-electron pairs. (A hole is a vacant quantum-mechanical state; it acts much like a particle.) Looking at the array, we can think of...
Ngày tải lên: 12/05/2014, 14:54