scientific american - 1999 08 - the oxygen project

... forms the 0 and 1 of the de- vice the absence or presence of one ex- tra Cooper pair in the finger, which is then called a single-Cooper-pair box. The researchers test that their device has the ... peas- ant family to care for the three- and-a-half-year-old Mario. For a while, things went as well as they could in the mid- dle of a war. On the farm, the boy watched the whe...

Ngày tải lên: 12/05/2014, 15:58

... to e-mail ad- dresses—fax to the number, and the document, including graphics and signa- tures, will appear in the recipient’s e-mail in-box. Received as a compressed graphic bit-map file, the ... surgeons would then direct the pellet through the brain by adjusting the forces of the various mag- nets. The pellet could tow a catheter, electrode or other device to minister to...

Ngày tải lên: 12/05/2014, 15:14

... Oklahoma-northern Ark- ansas-southern Missouri, the north- ern part of the lower Michigan peninsula and most of the na- tion’s coastal areas. —Rodger Doyle (rdoyle2@aol.com) RODGER DOYLE The U.S. ... more malleable,” Owren theorizes. In the same way, when the men in the experiment laughed the most with other men, they were probably honoring the age-old tradition of the bu...

Ngày tải lên: 12/05/2014, 16:04

... 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

... Witten com- ments. ÒThey also donÕt attempt to con- vey the importance of the ideas of phys- ics in mathematics.Ó JaÝe and Quinn have their support- ers. Richard M. Schoen, a mathematician at the Institute ... two infrared ones. The two photons are emitted si- multaneously, and the sum of their en- ergies exactly equals the energy of the parent photon. In other words, the col-...

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

... suggests that the Reagan ad- ministration seized on the radon issue in the mid-1980s to counter its anti- environment image. The issue suited Re- publicans, he contends, because home- ownersÑrather than ... it now sounds, the young Mayr was not a follower of Dar- win. Rather, like most other naturalists of the day, he subscribed to Jean-Bap- tiste LamarckÕs theory about the inhe...

Ngày tải lên: 12/05/2014, 14:57

... that they were the few Cretaceous survivors. The foundation of this theory began to shake in 1981, when fossils of Òop- posite birdsÓ were unearthed in China and, then, all over the Northern Hemi- sphere. ... and lead to the hy- poactivity seen there during clinical de- pression. If he is right, the theory would explain the gender gap, at least in part. Others at the NIMH have m...

Ngày tải lên: 12/05/2014, 15:01

... attractive, they undercut the usage-based services on which they make their money. In theory the compa- nies can respond by adjusting their pric- es to sell more ßat-rate services them- selves. ... Òinductivist, ameliorative, progressive, add-a-fact-at- a-time-donÕt-theorize-till-youÕre-old mod- el of doing science.Ó When I ask Gould if he believes, as Kuhn does, that science does not ad-...

Ngày tải lên: 12/05/2014, 15:01

... planet. The spacecraft examined the outer expanses of the earthÕs magnet- ic Þeld and took the Þrst mea- surements of the moonÕs far side since the days of the Apol- lo program. These images re- vealed ... first slide the trousers off onto the rope, then push one leg through the other. The outside leg is reversed twice in the process, leaving the trousers on the ro...

Ngày tải lên: 12/05/2014, 15:03