scientific american special edition - 2000 vol 11 no2 - the quest to beat aging

... FILMS getting ever older Copyright 2000 Scientific American, Inc. PRESENTS AG I NG THE QUEST TO BEAT 0974851 08716 52> SCIENTIFIC AMERICAN PRESENTS THE QUEST TO BEAT AGING Quarterly Volume 11, Number 2 QUARTERLY ... Pursuit while they pass the time at Mary Kikukawa Fichter’s “bus stop” —providing a latter-day Joe comes to visit and orga- nizes the game. T...

Ngày tải lên: 12/05/2014, 16:26

... ships, satellites, ground-based gauges and other TOP-OF -THE- LINE EQUIPMENT: The Doppler radar tower (above) near Washington Dulles Air- port is one of the workhorses intended to increase the accuracy and ... of the future: “Our warnings are made by the same people who issue the day -to- day forecasts.” The forecasters have to stay on top of the daily weather in or- der...

Ngày tải lên: 12/05/2014, 16:25

... it into its component substanc- es. The spectrometer then weighs the fragments to iden- tify the specific molecule they came from. The instru- ment, known as a GCMS, is the workhorse technolo- gy ... artificial means, was victo- rious in the 5,00 0- and 10,000-meter races at the 1976 Olympics in Montreal. TONY DUFFY Allsport Copyright 2000 Scientific American, Inc. TH...

Ngày tải lên: 12/05/2014, 16:26

... momentum. When the gas in the protogalaxies then started to cool, it con- tracted and started to fall toward the center. Just as ice-skaters spin faster when they pull in their arms, the gas rotated ... momentum come from? According to the standard picture, when proto- galaxies filled the universe, they exerted tidal forces on one an- other, causing them to spin. After the...

Ngày tải lên: 12/05/2014, 16:26

... and sexual be- havior of 1 5- to 19-year-olds. The survey The female condom’s manufac- turer, the Female Health Com- pany, reports that the plastic vaginal sheath is 79 to 95 per- cent effective ... inner ring covers the cervix, stretch- ing the sheath to line the walls of the vagina. The larger ring at the other end of the sheath remains outside the woman, pr...

Ngày tải lên: 12/05/2014, 16:23

... after the insult. As the subject was walking down the narrow hallway, a six-foot, three-inch, 250-pound accomplice of the experi- menter walked toward him down the middle of the corridor. Southerners who ... MANAGER 31 0-4 7 7-9 299 fax 31 0-4 7 7-9 179 lcarden@sciam.com SAN FRANCISCO Debra Silver SAN FRANCISCO MANAGER 41 5-4 0 3-9 030 fax 41 5-4 0 3-9 033 dsilver...

Ngày tải lên: 12/05/2014, 16:24

... rather than a hominid. The massive brow and cer- tain features on the base and rear of Sahelanthropus’s skull, they observed, call to mind the anatomy of a quadrupedal ape with a difficult -to- chew ... 1994, together with his col- leagues Berhane Asfaw of the Paleoan- thropology Laboratory in Addis Ababa and Gen Suwa of the University of To- kyo, White gave these fossils a new n...

Ngày tải lên: 12/05/2014, 16:27

... out to sea. The car- bon dioxide then sinks to the bottom of the ocean in the form of solid calcium car- bonate. Over millions of years, plate tec- tonics drives this carbonate down into the upper ... blown off the cold, dry continents of the time would have fostered the growth of marine phytoplank- ton, which then acted to pump carbon from the atmosphere to the Fe...

Ngày tải lên: 12/05/2014, 16:24

... MANAGER 41 5-4 0 3-9 030 fax 41 5-4 0 3-9 033 dsilver@sciam.com DALLAS THE GRIFFITH GROUP 97 2-9 3 1-9 001 fax 97 2-9 3 1-9 074 lowcpm@onramp.net CANADA FENN COMPANY , INC. 90 5-8 3 3-6 200 fax 90 5-8 3 3-2 116 dfenn@canadads.com EUROPE Roy ... reflective iridium. The mir- rors are nested inside one another to increase their collecting ability. They will focus...

Ngày tải lên: 12/05/2014, 16:24

... is the fill- ing in of the blind spot. The blind spot in each eye is caused by the lack of photore- ceptors in the area of the retina where the optic nerve leaves the retina and projects to the ... OBVIOUS that the purpose of vivid visual awareness is to feed into the cortical areas concerned with the implica- tions of what we see; from there the infor- mation shu...

Ngày tải lên: 12/05/2014, 16:26