scientific american - 2000 09 - muscles & genes are star athletes born, not made

... Other Earths SEPTEMBER 2000 $4.95 www.sciam.com ARE STAR ATHLETES BORN, NOT MADE? Muscles Genes & Brian Lewis, 1999 World Outdoor Gold Medalist Copyright 2000 Scientific American, Inc.Copyright 2000 Scientific ... HAZARDS Five-year-old 10-year-old Adult CELL-PHONE ENERGY penetrates more deeply into a child’s brain than an adult’s, as shown in these models. Copy...

Ngày tải lên: 12/05/2014, 16:04

... 22 ANTI GRAVITY C-A-T-T-T-T-T-T-T-T T he fog comes on little cat feet,” wrote Carl Sandburg. The great poet and historian may merely have been attempting to animate water va- por, but he presciently ... affirmation was short-lived. The back-to-back failures of the next two spacecraft, the $125-million Mars Climate Or- PAT RAWLINGS Copyright 2000 Scientific American, Inc. biter and the $16...

Ngày tải lên: 12/05/2014, 16:01

... SCI- ENTIFIC AMERICAN, 415 Madison Ave- nue, New York, N.Y. 1001 7-1 111, or fax (212) 35 5-0 408. Photocopying rights are hereby grant- ed by Scientific American, Inc., to li- braries and others registered ... diversi- ty springs from the size of these mini- gene families: there are more than 100 kinds of V (variable) genes, 12 D (diver- sity) genes and four J (joining) genes...

Ngày tải lên: 12/05/2014, 14:50

... explains how to cross- reference ICD-IX and ICD-X codes. So why does DSM-IV use codes from an earlier version of ICD? ÒIt may take another seven years before ICD-X stan- dards are adopted in this ... health on ICD stan- dards. In some cases, more than one DSM-IV disorder falls under the same ICD-IX heading. And the ICD-IX num- bers are diÝerent from those used in the ICD-X, which debuted...

Ngày tải lên: 12/05/2014, 14:58

... According to Bird, we are here today for the same reason we pre- fer one stereo system over another: bet- ter signal-to-noise ratio. Assuming that the number of func- tional genes an organism uses ... Black Star ROB NELSON Black Star Copyright 1995 Scientific American, Inc. export of software incorporating en- cryption algorithms with keys of 40 bits or less. Not covered by thi...

Ngày tải lên: 12/05/2014, 15:02

... howev- er, the consuming issues are not statisti- cal and political but personal and med- ical. What are the latest findings about how cancer develops and becomes le- thal? What is the most up-to-date ... Through mass production, Intel made micropro- cessors affordable, launching the per- sonal-computer industry and a multi- billion-dollar business. Now, 25 years later, a small start-u...

Ngày tải lên: 12/05/2014, 15:15

... that produce starbursts are rare in our cos- mic neighborhood. At 10 million light- years distant —about five times as far as the Andromeda galaxy —M82 is the nearest major starburst galaxy. But col- lisions ... similar experi- ments did not self-mutilate. That public statement won Moor-Jan- kowski no friends in the medical com- munity. “He has his own ethics,” Teleki notes. “And it certai...

Ngày tải lên: 12/05/2014, 15:29

... Scientific American, Inc. G 1-3 1 G 1-3 0 G 1-2 9 G 1-2 8 G 1-2 5 G 1-2 6 G 1-2 7 G 1-3 3 G 1-3 4 G 1-3 5 G 1-3 6 G 1-3 7 G 1-3 8 G 1-3 9 G2/ 3-2 2 G2/ 3-2 1 G2/ 3-1 8 G2/ 3-1 9 G2/ 3-2 0 G2/ 3-2 4 G2/ 3-2 5 G2/ 3-2 6 G2/ 3-2 7 G2/ 3-2 8 G2/ 3-2 9 G2/ 3-3 1 G2/ 3-3 0 CARNIVORE TRACKS HIPPARION TRACKS HIPPARION FOAL TRACKS 1979 ... TRACK...

Ngày tải lên: 12/05/2014, 15:43

... five minutes.Actually,“decapitat- ed snake heads are dangerous for be- tween 20 and 60 minutes after re- moval from the body of the snake,”Such- ard notes. “If that’s not dead, I don’t know what ... that “educa- tion to prevent snake- bites should include warnings against han- dling recently killed snakes.” In the inter- ests of science edu- cation and public safe- ty, S CIENTIFIC AMERIC...

Ngày tải lên: 12/05/2014, 15:58

... groups —defined as long-distance movers are the subject of this map. The 26 million or so Americans who move within their counties every year are not included. The majority of long-distance movers are people ... fea- tures, because teeth are often all that re- mains of these tiny creatures after mil- lions of years. Placentals, marsupials and their closest fossil relatives are char...

Ngày tải lên: 12/05/2014, 16:01