Copyright (c) 2010 Yahoo! Inc. All rights reserved. http://news.yahoo.com/most-popular/recommended/science Most Recommended Science en-us Wed, 10 Feb 2010 01:17:22 GMT 5 142 18 http://news.yahoo.com/most-popular/recommended/science http://l.yimg.com/a/i/us/nws/th/main_142c.gif http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/ap/as_china_pollution_census ap/20100209/as_china_pollution_census AP science Tue, 09 Feb 2010 09:18:56 GMT <p><a href="http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/ap/as_china_pollution_census"><img src="http://d.yimg.com/a/p/afp/20100209/capt.photo_1265705563505-1-0.jpg?x=130&y=82&q=85&sig=UiOOtttNnIh.LA4ALxSUJw--" align="left" height="82" width="130" alt="Farmers work their field near a reservoir in the outskirts of Beijing. China on has named pollution from farms as a major cause for concern, as the world's biggest emitter of greenhouse gases released its first nationwide survey on sources of environmental degradation.(AFP/File/Frederic J. Brown)" border="0" /></a>AP - China has revealed its most ambitious measure of what explosive development has done to its environment, saying Tuesday its first national pollution census has mapped nearly 6 million sources of industrial, residential and agricultural waste.</p><br clear="all"/> <p><a href="http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/ap/as_china_pollution_census"><img src="http://d.yimg.com/a/p/afp/20100209/capt.photo_1265705563505-1-0.jpg?x=130&y=82&q=85&sig=UiOOtttNnIh.LA4ALxSUJw--" align="left" height="82" width="130" alt="photo" title="Farmers work their field near a reservoir in the outskirts of Beijing. China on has named pollution from farms as a major cause for concern, as the world's biggest emitter of greenhouse gases released its first nationwide survey on sources of environmental degradation.(AFP/File/Frederic J. Brown)" border="0"/></a></p><br clear="all"/> (AP) http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/afp/chinaanimaltiger afp/20100209/chinaanimaltiger AFP science Tue, 09 Feb 2010 11:40:41 GMT <p><a href="http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/afp/chinaanimaltiger"><img src="http://d.yimg.com/a/p/afp/20100209/capt.photo_1265623634556-1-0.jpg?x=87&y=130&q=85&sig=DbI1ZrhIMyIBJooWewlsog--" align="left" height="130" width="87" alt="A tiger cools off from summer heat in a pool at a zoo in Hefei, east China's Anhui province. China said it had nearly 6,000 tigers in captivity and could breed 1,000 more every year, amid international controversy over the benefits of farming the endangered species.(AFP/File/Str)" border="0" /></a>AFP - China said Tuesday it had nearly 6,000 tigers in captivity and could breed 1,000 more every year, amid international controversy over the benefits of farming the endangered species.</p><br clear="all"/> <p><a href="http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/afp/chinaanimaltiger"><img src="http://d.yimg.com/a/p/afp/20100209/capt.photo_1265623634556-1-0.jpg?x=87&y=130&q=85&sig=DbI1ZrhIMyIBJooWewlsog--" align="left" height="130" width="87" alt="photo" title="A tiger cools off from summer heat in a pool at a zoo in Hefei, east China's Anhui province. China said it had nearly 6,000 tigers in captivity and could breed 1,000 more every year, amid international controversy over the benefits of farming the endangered species.(AFP/File/Str)" border="0"/></a></p><br clear="all"/> (AFP) http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/nm/us_toyota_lawsuit nm/20100209/us_toyota_lawsuit Reuters science Tue, 09 Feb 2010 03:03:11 GMT <p><a href="http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/nm/us_toyota_lawsuit"><img src="http://d.yimg.com/a/p/afp/20100209/capt.photo_1265517569455-3-0.jpg?x=106&y=130&q=85&sig=QoSIbJXTCsIg.LTdw.gCmg--" align="left" height="130" width="106" alt="Facts on the anti-locking braking system for cars, the focus of concern in the Toyota Prius safety complaints.(AFP/Graphic)" border="0" /></a>Reuters - Toyota faced its first U.S. class-action lawsuits stemming from complaints of faulty brakes in its top-selling Prius hybrid car and from investors claiming they were misled about problems with unintended acceleration in a wide range of models.</p><br clear="all"/> <p><a href="http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/nm/us_toyota_lawsuit"><img src="http://d.yimg.com/a/p/afp/20100209/capt.photo_1265517569455-3-0.jpg?x=106&y=130&q=85&sig=QoSIbJXTCsIg.LTdw.gCmg--" align="left" height="130" width="106" alt="photo" title="Facts on the anti-locking braking system for cars, the focus of concern in the Toyota Prius safety complaints.(AFP/Graphic)" border="0"/></a></p><br clear="all"/> (Reuters) http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/nm/us_toyota nm/20100209/us_toyota Reuters science Tue, 09 Feb 2010 21:17:42 GMT <p><a href="http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/nm/us_toyota"><img src="http://d.yimg.com/a/p/rids/20100209/i/r3136313318.jpg?x=130&y=86&q=85&sig=gRxTr4jx7S1lIoKKFLMrVg--" align="left" height="86" width="130" alt="Toyota Motor Corp's managing director Yuji Yokoyama (C) bows after submitting a document of a recall to an official of the Transport Ministry, Ryuji Masuno (L), at the Transport Ministry in Tokyo February 9, 2010. Toyota Motor Corp is recalling nearly half a million of its flagship Prius and other hybrid cars for braking problems, a third major recall since September and a further blow to the reputation of the world's largest automaker. REUTERS/Toru Hanai" border="0" /></a>Reuters - The spiraling crisis at Toyota Motor Corp deepened on Tuesday as the automaker said it would recall thousands of Camry sedans as well as nearly half a million new Prius and other hybrid cars to fix steering and braking problems.</p><br clear="all"/> <p><a href="http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/nm/us_toyota"><img src="http://d.yimg.com/a/p/rids/20100209/i/r3136313318.jpg?x=130&y=86&q=85&sig=gRxTr4jx7S1lIoKKFLMrVg--" align="left" height="86" width="130" alt="photo" title="Toyota Motor Corp's managing director Yuji Yokoyama (C) bows after submitting a document of a recall to an official of the Transport Ministry, Ryuji Masuno (L), at the Transport Ministry in Tokyo February 9, 2010. Toyota Motor Corp is recalling nearly half a million of its flagship Prius and other hybrid cars for braking problems, a third major recall since September and a further blow to the reputation of the world's largest automaker. REUTERS/Toru Hanai" border="0"/></a></p><br clear="all"/> (Reuters) http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/afp/japanusautorecallcompanytoyota afp/20100209/japanusautorecallcompanytoyota AFP science Tue, 09 Feb 2010 19:58:25 GMT <p><a href="http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/afp/japanusautorecallcompanytoyota"><img src="http://d.yimg.com/a/p/afp/20100209/capt.photo_1265739124578-3-0.jpg?x=130&y=78&q=85&sig=nzUPN46TkS2.H_lwK7vu4w--" align="left" height="78" width="130" alt="Interactive graphic on the troubled Japanese car manufacturer Toyota as the company recalls hundreds of thousands of hybrid vehicles around the world, including its best-selling Prius, to repair a flaw in the braking system.(AFP iactiv)" border="0" /></a>AFP - Toyota said Tuesday it was recalling hundreds of thousands of hybrid vehicles globally, including the best-selling Prius, plunging it deeper into crisis as lawsuits in the United States piled up.</p><br clear="all"/> <p><a href="http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/afp/japanusautorecallcompanytoyota"><img src="http://d.yimg.com/a/p/afp/20100209/capt.photo_1265739124578-3-0.jpg?x=130&y=78&q=85&sig=nzUPN46TkS2.H_lwK7vu4w--" align="left" height="78" width="130" alt="photo" title="Interactive graphic on the troubled Japanese car manufacturer Toyota as the company recalls hundreds of thousands of hybrid vehicles around the world, including its best-selling Prius, to repair a flaw in the braking system.(AFP iactiv)" border="0"/></a></p><br clear="all"/> (AFP) http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/ap/eu_toyota_europe_recall ap/20100209/eu_toyota_europe_recall AP science Tue, 09 Feb 2010 19:20:56 GMT AP - Toyota in Europe is no where near the hot-selling carmaker it is in the United States. But the troubled auto maker's miseries have hit home there with the recall of the Prius, which has become something of an icon in environment-conscious Europe. http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/afp/japanautocompanyrecalltoyotahybrids afp/20100209/japanautocompanyrecalltoyotahybrids AFP science Tue, 09 Feb 2010 06:54:08 GMT <p><a href="http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/afp/japanautocompanyrecalltoyotahybrids"><img src="http://d.yimg.com/a/p/afp/20100209/capt.photo_1265698432822-1-0.jpg?x=130&y=119&q=85&sig=EuVNPiHReYuvxCCzY5t8LQ--" align="left" height="119" width="130" alt="Toyota Motor has said it will recall about 400,000 hybrid vehicles around the world, including its latest Prius model, to fix faulty brakes.(AFP/File/Yoshikazu Tsuno)" border="0" /></a>AFP - Toyota Motor said Tuesday that it would recall about 400,000 hybrid vehicles around the world, including its latest Prius model, to fix faulty brakes.</p><br clear="all"/> <p><a href="http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/afp/japanautocompanyrecalltoyotahybrids"><img src="http://d.yimg.com/a/p/afp/20100209/capt.photo_1265698432822-1-0.jpg?x=130&y=119&q=85&sig=EuVNPiHReYuvxCCzY5t8LQ--" align="left" height="119" width="130" alt="photo" title="Toyota Motor has said it will recall about 400,000 hybrid vehicles around the world, including its latest Prius model, to fix faulty brakes.(AFP/File/Yoshikazu Tsuno)" border="0"/></a></p><br clear="all"/> (AFP) http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/ap/us_obama_energy ap/20100209/us_obama_energy AP science Tue, 09 Feb 2010 21:14:31 GMT <p><a href="http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/ap/us_obama_energy"><img src="http://d.yimg.com/a/p/ap/20100209/capt.3ee32324a9354a47b1ef19d0a7c8760d.obama_dcpm134.jpg?x=130&y=120&q=85&sig=q93xyFiCXXjwRQapitNOog--" align="left" height="120" width="130" alt="President Barack Obama approaches the podium to begin the daily press briefing at the White House, in Washington, Tuesday, Feb. 9, 2010. (AP Photo/Pablo Martinez Monsivais)" border="0" /></a>AP - President Barack Obama says the country must develop cleaner energy technologies while at the same time still relying upon traditional power sources like nuclear and coal.</p><br clear="all"/> <p><a href="http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/ap/us_obama_energy"><img src="http://d.yimg.com/a/p/ap/20100209/capt.3ee32324a9354a47b1ef19d0a7c8760d.obama_dcpm134.jpg?x=130&y=120&q=85&sig=q93xyFiCXXjwRQapitNOog--" align="left" height="120" width="130" alt="photo" title="President Barack Obama approaches the podium to begin the daily press briefing at the White House, in Washington, Tuesday, Feb. 9, 2010. (AP Photo/Pablo Martinez Monsivais)" border="0"/></a></p><br clear="all"/> (AP) http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/afp/usspacesunnasa afp/20100209/usspacesunnasa AFP science Tue, 09 Feb 2010 17:13:53 GMT <p><a href="http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/afp/usspacesunnasa"><img src="http://d.yimg.com/a/p/afp/20100209/capt.photo_1265735551171-1-0.jpg?x=100&y=130&q=85&sig=L9dRR257BVNqKz5.dW.qMw--" align="left" height="130" width="100" alt="This NASA artist's rendition shows the Solar Dynamics Observatory (SDO) which is scheduled to be launched from an Atlas V rocket Wednesday. The SDO is expected to give space scientists the most detailed glimpse ever of our sun and its complicated workings.(AFP/NASA-HO)" border="0" /></a>AFP - NASA made final preparations Tuesday for the launch of its Solar Dynamics Observatory (SDO) which promises to give space scientists the most detailed glimpse ever of our sun and its complicated workings.</p><br clear="all"/> <p><a href="http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/afp/usspacesunnasa"><img src="http://d.yimg.com/a/p/afp/20100209/capt.photo_1265735551171-1-0.jpg?x=100&y=130&q=85&sig=L9dRR257BVNqKz5.dW.qMw--" align="left" height="130" width="100" alt="photo" title="This NASA artist's rendition shows the Solar Dynamics Observatory (SDO) which is scheduled to be launched from an Atlas V rocket Wednesday. The SDO is expected to give space scientists the most detailed glimpse ever of our sun and its complicated workings.(AFP/NASA-HO)" border="0"/></a></p><br clear="all"/> (AFP) http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/ap/us_space_shuttle ap/20100210/us_space_shuttle AP science Wed, 10 Feb 2010 00:06:37 GMT <p><a href="http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/ap/us_space_shuttle"><img src="http://d.yimg.com/a/p/ap/20100208/capt.699b1652c1694cc89922bf8708a652a5.aptopix_space_shuttle_ksc120.jpg?x=78&y=130&q=85&sig=YR09K4BXESNhiS3TTJyC7Q--" align="left" height="130" width="78" alt="Space shuttle Endeavour lifts-off from the Kennedy Space Center at Cape Canaveral, Fla., Monday, Feb. 8, 2010. Endeavour is carrying six astronauts who will deliver a room and observation deck to the International Space Station. A piece of foam insulation is seen falling to the right of the orbiter. (AP Photo/John Raoux)" border="0" /></a>AP - Endeavour zoomed toward a midnight rendezvous with the International Space Station late Tuesday, and NASA grew ever more optimistic that the shuttle is free of any launch damage.</p><br clear="all"/> <p><a href="http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/ap/us_space_shuttle"><img src="http://d.yimg.com/a/p/ap/20100208/capt.699b1652c1694cc89922bf8708a652a5.aptopix_space_shuttle_ksc120.jpg?x=78&y=130&q=85&sig=YR09K4BXESNhiS3TTJyC7Q--" align="left" height="130" width="78" alt="photo" title="Space shuttle Endeavour lifts-off from the Kennedy Space Center at Cape Canaveral, Fla., Monday, Feb. 8, 2010. Endeavour is carrying six astronauts who will deliver a room and observation deck to the International Space Station. A piece of foam insulation is seen falling to the right of the orbiter. (AP Photo/John Raoux)" border="0"/></a></p><br clear="all"/> (AP) http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/space/newsolarobservatorytounlocksunsmysteries space/20100209/newsolarobservatorytounlocksunsmysteries SPACE.com science Tue, 09 Feb 2010 16:00:07 GMT SPACE.com - A powerful new solar observatory will spend the next five years recording images of the sun with 10 times better resolution than HD television, peering deep within the sun's layers to reveal just how solar storms erupt. The observations could help scientists build the first effective models for space weather forecasting. http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/afp/indiafoodagriculturebiotechfarm afp/20100209/indiafoodagriculturebiotechfarm AFP science Tue, 09 Feb 2010 17:18:04 GMT <p><a href="http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/afp/indiafoodagriculturebiotechfarm"><img src="http://d.yimg.com/a/p/afp/20100209/capt.photo_1265718376781-2-0.jpg?x=86&y=130&q=85&sig=BiKIVRqUNb3UfBDO7aQY.g--" align="left" height="130" width="86" alt="An Indian protester dressed as a brinjal (aubergine) waits for the arrival of Indian Environment Minister Jairam Ramesh in Ahmedabad in January 2010. India refused to grant permission Wednesday for the commercial cultivation of its first genetically modified (GM) food crop, citing problems of public trust and "inadequate" science.(AFP/File/Sam Panthaky)" border="0" /></a>AFP - India refused to grant permission Wednesday for the commercial cultivation of its first genetically modified (GM) food crop, citing problems of public trust and "inadequate" science.</p><br clear="all"/> <p><a href="http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/afp/indiafoodagriculturebiotechfarm"><img src="http://d.yimg.com/a/p/afp/20100209/capt.photo_1265718376781-2-0.jpg?x=86&y=130&q=85&sig=BiKIVRqUNb3UfBDO7aQY.g--" align="left" height="130" width="86" alt="photo" title="An Indian protester dressed as a brinjal (aubergine) waits for the arrival of Indian Environment Minister Jairam Ramesh in Ahmedabad in January 2010. India refused to grant permission Wednesday for the commercial cultivation of its first genetically modified (GM) food crop, citing problems of public trust and "inadequate" science.(AFP/File/Sam Panthaky)" border="0"/></a></p><br clear="all"/> (AFP) http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/space/saturnsmoondoesharboranoceannewevidencesuggests space/20100209/saturnsmoondoesharboranoceannewevidencesuggests SPACE.com science Tue, 09 Feb 2010 18:45:58 GMT SPACE.com - Icy plumes of water vapor erupting from Saturn's moon Enceladus have left scientists divided over whether a liquid ocean lies hidden beneath the icy surface. Now evidence from a 2008 plume fly-through by NASA's Cassini spacecraft has turned up short-lived water ions that suggest liquid water does indeed exist inside the moon. http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/livescience/emergingtechcouldmaketomorrowscarssafer livescience/20100209/emergingtechcouldmaketomorrowscarssafer LiveScience.com science Tue, 09 Feb 2010 16:55:23 GMT LiveScience.com - Toyota's recent troubles with sticking accelerators in many of its vehicles and braking issues in its flagship Prius gas-electric hybrid could leave you wondering how safe your next new car will be, whether Toyota-made or otherwise. http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/livescience/thedangersofthirdhandsmokerevealed livescience/20100209/thedangersofthirdhandsmokerevealed LiveScience.com science Tue, 09 Feb 2010 17:25:40 GMT LiveScience.com - Add a new health threat to smoking: In addition to the harm caused by actually smoking and exposure to second-hand smoke, so-called third-hand smoke may also pose a threat, particularly to babies and toddlers. http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/livescience/3dmoviesarehardertopiratefornow livescience/20100209/3dmoviesarehardertopiratefornow LiveScience.com science Tue, 09 Feb 2010 21:10:06 GMT LiveScience.com - James Cameron's 3-D epic Avatar wowed audiences with its immersive special effects, but Hollywood is hoping the technology can do something more: Give film studios breathing room in the fight against movie piracy. "There is going to be a good period where 3-D has got a little more value, because it can't be purloined from the theater," said Michael Peyser, a University of Southern California (USC) professor of production and executive producer of 2007's U2 3D. http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/ap/us_travelers_lobbying ap/20100209/us_travelers_lobbying AP science Tue, 09 Feb 2010 17:55:47 GMT AP - Insurer Travelers Cos. spent $1.66 million in the fourth quarter to lobby the federal government on global warming issues, workers compensation, consumer protection rights and other issues, according to a recent disclosure report. http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/space/astronautsinspectshuttlefordamage space/20100209/astronautsinspectshuttlefordamage SPACE.com science Tue, 09 Feb 2010 13:31:48 GMT SPACE.com - Astronauts aboard the space shuttle Endeavour inspected spacecraft Tuesday to search for any signs of heat shield damage as they head to the International Space Station. http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/afp/oly2010climate afp/20100209/oly2010climate AFP science Tue, 09 Feb 2010 03:05:33 GMT <p><a href="http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/afp/oly2010climate"><img src="http://d.yimg.com/a/p/afp/20100209/capt.photo_1265684549294-1-0.jpg?x=130&y=83&q=85&sig=dRBKpl9WZhHRlYxN7sbcpw--" align="left" height="83" width="130" alt="A stockpile of snow brought in by helicopter waits to be spread at the site on the Cypress Mountain where the Freestyle Skiing and Snowboarding Winter Olympic events will be held, north of Vancouver, on February 6. Winter Olympic host city Vancouver saw its warmest January on record, marked by a lack of snow and daffodils in bloom just days before the start of the Games.(AFP/File/Mark Ralston)" border="0" /></a>AFP - Global warming is starting to worry the International Olympic Committee, with concern mounting over how it might affect future Games.</p><br clear="all"/> <p><a href="http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/afp/oly2010climate"><img src="http://d.yimg.com/a/p/afp/20100209/capt.photo_1265684549294-1-0.jpg?x=130&y=83&q=85&sig=dRBKpl9WZhHRlYxN7sbcpw--" align="left" height="83" width="130" alt="photo" title="A stockpile of snow brought in by helicopter waits to be spread at the site on the Cypress Mountain where the Freestyle Skiing and Snowboarding Winter Olympic events will be held, north of Vancouver, on February 6. Winter Olympic host city Vancouver saw its warmest January on record, marked by a lack of snow and daffodils in bloom just days before the start of the Games.(AFP/File/Mark Ralston)" border="0"/></a></p><br clear="all"/> (AFP) http://us.rd.yahoo.com/dailynews/rss/highestratedsc/*http://news.yahoo.com/s/livescience/worldssmallestsolarpoweredsensorrunsalmostforever livescience/20100209/worldssmallestsolarpoweredsensorrunsalmostforever LiveScience.com science Tue, 09 Feb 2010 20:15:55 GMT LiveScience.com - A tiny solar-powered sensor, smaller than Abe Lincoln's head on a penny, can supply almost perpetual energy, its creators say.