scientific american - 2004 02 - the future looks flexible

... that the mi- grating bats may not be using their echolocation when the collisions occur. Others spec- ulate that the wind turbines may be emitting high-pitched sounds that draw the bats to the ... two other groups the car- charodontosaurs and the spinosaurs—man- aged to evolve similarly supersize propor- tions.) In recent years, a few prime-mover hy- potheses have emerged, attrib...

Ngày tải lên: 12/05/2014, 16:19

... pause” are three must-have func- tions for future d-entertainment. The third forerunner of the ultimate d-entertain- ment platform is the widely popular video-game console. The release of Sega’s ... communi- cate through a house-wide wireless net. A radio-locating system can pinpoint any tagged object to within 10 feet. The two- gigabit-per-second connection to the uni- versity...

Ngày tải lên: 12/05/2014, 16:06

... disrupting the signals between neurons. COPYRIGHT 2004 SCIENTIFIC AMERICAN, INC. 28 SCIENTIFIC AMERICAN MAY 2004 I n the 18 years since they were dis- covered, high-temperature supercon- ductors ... what remains of the mess left by the Exxon Valdez. The oil compo- nents are poisoning the otters. COPYRIGHT 2004 SCIENTIFIC AMERICAN, INC. www.sciam.com SCIENTIFIC...

Ngày tải lên: 12/05/2014, 16:20

... bats, the hand part of the wing generates the thrust, and the rest of the wing provides the lift. Jeremy M. V. Rayner of the University of Bristol showed in the late 1970s that the down-and-forward ... crumble un- der the rules of the new economy. In- stead of justifying the common good, a natural monopoly hinders its growth. Here is the friction-free-economy inter-...

Ngày tải lên: 12/05/2014, 15:33

... the turn of the 20th century.” The stone “contains more lithium than any other stone on the planet” and “emits a signa- ture one-of-a-kind healing energy.” How does the Golden ‘C’ water get these ... subjects at the time of the serendipitous observation. Of the 30 individuals who received the EP-MRSI scans, 23 reported immediate mood im- provement, the team says in the J...

Ngày tải lên: 12/05/2014, 16:19

... Percussion COPYRIGHT 2004 SCIENTIFIC AMERICAN, INC. A 400-YEAR-OLD HOAX? • $1-MILLION PROOF FOR THE SHAPE OF SPACE JULY 2004 WWW.SCIAM.COM Mad Cow Disease: Faster Tests, Future Therapies When Methane Ruled ... PAP 6 T cells then attack PAP- containing cancer cell 40 SCIENTIFIC AMERICAN JULY 2004 COPYRIGHT 2004 SCIENTIFIC AMERICAN, INC. quires isolating the patient’s w...

Ngày tải lên: 12/05/2014, 16:20

... 4,400 12-BILLION-YEAR- OLD AGE TRACK 15-BILLION-YEAR- OLD AGE TRACK NGC 288 NGC 362 Copyright 1992 Scientific American, Inc. means that within the halo the only re- maining main-sequence stars are the extremely ... declines as the reefs get farther away from two centersÑone in the Indo-Pa- ciÞc and the other in the Caribbean. The outlines of a map marking plum- meting dive...

Ngày tải lên: 12/05/2014, 14:48

... the superconduc- tor. There they decorate the regions where the magnet- ic-flux lines pass through the surface. The iron parti- cles “stick” to the surface be- cause of the slight attractive forces ... In studies commis- sioned by the University of Toronto and the American Academy of Arts and Sci- ences, these experts reported their ini- tial Þndings. The evidence that t...

Ngày tải lên: 12/05/2014, 14:48

... aggre- gate. The parts of the receptors that lie inside the cell then assume a distinc- tive enzymatic role: they attach phos- phate groups to themselves and to one another at the sites of the amino ... Stealth Þght- ers, F-15s and F-16sÑAmericaÕs top-of- the- line ÞghtersÑand the sturdy A-10 ground-attack airplane. Marine and navy aviation units will augment this total. C ontrol...

Ngày tải lên: 12/05/2014, 14:50

... powers can help them rise to the top. Since then, the Morrises and Alexan- der have had a falling-out, with each side accusing the other of hogging cred- it for the concept of nonlethality. ÒAlex- ander ... of the AC Þeld. When the marble is hopping down the egg tray with the help of the AC Þeld, augmenting the av- erage tilt of the egg tray by increasing the DC voltag...

Ngày tải lên: 12/05/2014, 14:54