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FILE - In this Feb. 15, 2000 file photo, a  giant Sitka spruce stands tall near Seaside, Ore., Feb. 15, 2000.  Researchers will uproot moisture-loving Sitka spruce and Western redcedar that grace British Columbia's coastal rainforests and drop their seedlings in the dry ponderosa pine forests of Idaho. Scientist are planting trees that don't certain climates in a bold experiment to move trees threatened by global warming into places where they may thrive amid a changing climate. (AP Photo/Jeff Barnard)

HOT ISSUE: Should we deliberately move species?

1 hour, 8 minutes ago

LOS ANGELES - On naked patches of land in western Canada and United States, scientists are planting trees that don't belong there. It's a bold experiment to move trees threatened by global warming into places where they may thrive amid a changing climate.

  • This image provided by NASA shows the underside of the crew cabin near the nose cap of the Space Shuttle Endeavour taken by an Expedition 20 crewmember during a survey of the approaching vehicle prior to docking with the International Space Station Friday July 17, 2009. Endeavour crew performed a back-flip for the rendezvous pitch maneuver. Mission Control said Saturday Endeavour looks to be in fine shape for re-entry at the end of the month. Areas where the heat tiles were dinged during Wednesday's launch can be seen in this image. (AP Photo/NASA)
    Astronauts deal with flooded toilet in orbit 2 hours, 39 minutes ago

    CAPE CANAVERAL, Fla. - The bathroom lines at the already crowded space shuttle and space station complex got a lot longer Sunday because of a flooded toilet.

  • FILE - In this July  1969 file photo,  Astronaut Edwin Aldrin walks by the footpad of the Apollo 11 Lunar Module. (AP/Photo, NASA, file)
    40 years later, moon still giant leap for mankind Sun Jul 19, 2:02 PM ET

    WASHINGTON - The measure of what humanity can accomplish is a size 9 1/2 bootprint. It belongs to Neil Armstrong, the first man on the moon. It will stay on the moon for millions of years with nothing to wipe it away, serving as an almost eternal testament to a can-do mankind.

  • FILE - In this July 20, 1969 file photo,  Astronaut Edwin E. 'Buzz' Aldrin Jr.  poses for a photograph beside the U.S. flag deployed on the moon during the Apollo 11 mission.   (AP Photo/Neil Armstrong, NASA, file)
    Russia still blue over moon landing 40 years later Sun Jul 19, 2:01 PM ET

    MOSCOW - When Neil Armstrong stepped onto the surface of the moon, it was a first for the Soviet Union — the first time the U.S. had beaten the U.S.S.R in the space race.

  • FILE - In this July 20, 1969 file photo,  Apollo 11 astronaut Neil Armstrong steps down from the lunar module lander and becomes the first man to set foot on the moon. A huge shadow of the Lunar module is cast on the moon's surface. Photo was made from 16mm color film made with a Mauer camera at 6 and 12 frames per second. (AP Photo/NASA, file)
    Where were you when Apollo 11 landed? Not born yet Sun Jul 19, 12:57 PM ET

    WASHINGTON - Most Americans have never known a world where man hasn't been to the moon. It used to be a given that people knew where they were when man first walked on the moon on July 20, 1969, watching the black-and-white images on television. But now most Americans don't know where they were because the majority of Americans hadn't been born yet.

  • FILE - In this July 5, 1969 file photo,  Astronaut Neil Armstrong, left, the first man scheduled to walk on the moon, displays a plaque that will be attached to a landing leg of the lunar module descent stage and will be left on the moon by the Apollo 11 astronauts as Col. Edwin E. 'Buzz' Aldrin, center, holds the Apollo 11 insigna at a news conference at the Space Center. Command Module pilot Lt. Col. Michael Collins is at right. (AP Photo, file)
    Apollo 11 crew: Aldrin likes spotlight, 2 shun it Sun Jul 19, 12:56 PM ET

    CAPE CANAVERAL, Fla. - In the 40 years since Apollo 11, some of the key players, most notably Neil Armstrong, have steered clear of the increasingly bright glare of the moonlight cast by the historic lunar landing. Others have embraced it. Almost all have written books detailing not only themselves but the glory days of space.

  • In this Wednesday June 24, 2009 photo, With children playing on the athletic field below, Wade McGillis, professor of Earth and Environmental Engineering at Columbia University, makes an adjustment to his rooftop carbon dioxide monitor at an elementary school in the Harlem neighborhood of New York, Wednesday June 24, 2009. The urban experiment shows a growing interest by researchers in tracking how much of the heat-trapping gas a city, neighborhood or building puts in the atmosphere, and how much the urban environment can suck out. (AP Photo/Bebeto Matthews)
    Scientists zoom in on carbon dioxide in NYC Sun Jul 19, 12:39 PM ET

    NEW YORK - Wade McGillis peered up at the structure propped like a high-tech stick figure — minus the head — on an elementary school roof. Then he examined the electronics attached to its spindly metal frame, looking out over the Harlem brownstones nearby and the skyscrapers farther away.

  • Famous lost word: The 'a' in 'one small step' line Sun Jul 19, 12:21 PM ET

    WASHINGTON - When Neil Armstrong first spoke from the moon, he said one thing and people on Earth heard another. What the world heard was grammatically flubbed: "That's one small step for man; one giant leap for mankind." Armstrong insists he said: "That's one small step for 'a' man." It's just that people just didn't hear it.

  • In this July 20, 1969 photo provided by NASA and taken by Lt. Michael Collins through the window of the lunar command module, the Apollo 11 lunar module decends to the surface of the moon carrying astronauts Neil Armstong and Edwin 'Buzz' Aldrin. Monday, July 20, 2009 is the 40th anniversary of Armstrong’s and Aldrin’s historic first steps on the moon. (AP Photo/NASA) NO SALES
    NY lunar module builders remember 1969 landing Sat Jul 18, 1:36 PM ET

    BETHPAGE, N.Y. - John Devaney and his colleagues weren't exactly sure what Neil Armstrong would set foot on when he climbed down the ladder of the lunar module to the surface of the moon.

  • In this image rendered from video and released by NASA, space shuttle Endeavour is shown after docking with the  international space station Friday, July 17, 2009. (AP Photo/NASA TV)
    Spacewalk Day: Astronauts set for first outing Sat Jul 18, 10:37 AM ET

    CAPE CANAVERAL, Fla. - It's spacewalking day at the shuttle-station complex. At high noon Saturday, two astronauts will venture out to help attach a platform for science experiments. It's the third and final piece of Japan's huge billion-dollar lab. And it's the first of five spacewalks planned for the shuttle flight.

  • This 1969 NASA photo shows astronaut Edwin E. "Buzz" Aldrin, Jr. removing a scientific experiment from the Lunar Module "Eagle" during the Apollo 11 lunar landing mission. Man's first trip to the moon is about to blast off anew in an online recreation intended to enthrall an Internet generation not yet born when the US mission made history 40 years ago.(AFP/HO/File)
    New NASA photos show Apollo leftovers on the moon Fri Jul 17, 9:30 PM ET

    WASHINGTON - New NASA photos of the moon show the leftovers from man's exploration 40 years ago. For the first time, photos from space pinpoint equipment left behind from Apollo landings, and even the well-worn tracks made by astronauts on the moon surface. The images are from the Lunar Reconnaissance Orbiter, which was launched last month and now circles the moon in search of future landing sites.

  • Apollo 11 astronaut Buzz Aldrin speaks during a book signing Friday, July 17, 2009 in Dayton, Ohio. (AP Photo/David Kohl)
    Aldrin reflects on first moon landing Fri Jul 17, 8:02 PM ET

    DAYTON, Ohio - Buzz Aldrin still has the felt-tipped pen he used as a makeshift switch needed to fire up the engines that lifted him and fellow Apollo 11 astronaut Neil Armstrong off the moon and started their safe return to Earth nearly 40 years ago.

  • Hardware problem blamed on NASA satellite crash Fri Jul 17, 4:00 PM ET

    LOS ANGELES - A piece of rocket hardware failed to separate during the launch of a NASA climate satellite earlier this year, causing it crash back to Earth, according to an accident summary released Friday.

  • Five year old Ashton Mitchell of Arlington, Virginia plays with a robot toy in front a painting of an astronaut walking on the moon at the National Air and Space Museum in Washington, DC, on July 16, 2009 . The United States this week marks the 40th anniversary of the historic first moon walk, with President Barack Obama kicking off events by meeting Monday with the crew of the Apollo 11 mission.(AFP/Getty Images/File/Mark Wilson)
    NASA lost moon footage, but Hollywood restores it Thu Jul 16, 8:26 PM ET

    WASHINGTON - NASA could put a man on the moon but didn't have the sense to keep the original video of the live TV transmission.

  • Science proves what jockeys know: Posture matters Thu Jul 16, 2:00 PM ET

    WASHINGTON - Over a century after a Yankee Doodle jockey revolutionized how racehorses are ridden, scientists are figuring out why a jockey's posture speeds up the horse.

  • Survey: Americans expect widespread swine flu Thu Jul 16, 12:41 PM ET

    ATLANTA - About three out of five Americans believe there will be widespread swine flu cases this fall or winter, but most are not worried it will strike them or their family, according to a survey released Thursday.

  • STS-127 crew members from left, Mission Specialists David Wolf, Christopher Cassidy, Thomas Mashburn, Flight Engineer Timothy Kopra, Mission Specialist Julie Payette, of Canada, Pilot Douglas Hurley, and Commander Mark Polansky pose for a photo before boarding the astronaut van and a trip to launch pad 39-A and a planned liftoff on the space shuttle Endeavour Wednesday July 15, 2009 at the Kennedy Space Center in Cape Canaveral, Fla.  Seven astronauts are scheduled to liftoff early this evening for a trip to the international space station. (AP Photo/Chris O'Meara)
    Crew includes Twittering skipper, singer, ER doc Wed Jul 15, 6:46 PM ET

    CAPE CANAVERAL, Fla. - The astronauts headed to the international space station include a Twittering skipper, a classically trained musician who named her son after one of Columbia's fallen astronauts, and a former Navy SEAL who went into Afghanistan two weeks after the Sept. 11, 2001, terrorist attacks.

  • Space invaders: Asteroid belt has rocks from afar Wed Jul 15, 3:43 PM ET

    WASHINGTON - A new astronomy theory says the solar system's main asteroid belt is littered with icy invaders from far away.

  • The team of researchers, from left, Russian Sergei Ryazansky,  Aleksei Baranov, German Oliver Knickel, Russian Aleksei Shpakov, French Cyrille Fournier and Russian Oleg Artemyev are greeted after ending an imitated flight to Mars in Moscow, Tuesday, July 14, 2009. The four Russians, a German and a Frenchman emerged from three months of isolation in Soviet-era capsules in Moscow Tuesday, after simulating a three-month mission to Mars for the Russian and European space agencies. (AP Photo/Mikhail Metzel)
    6 men endure Mars flight simulation experiment Wed Jul 15, 4:58 AM ET

    MOSCOW - Russian engineers broke a red wax seal and six men emerged from a metal hatch after 105 days of isolation in a mock spacecraft, still smiling after testing the stresses that space travelers may face on the journey to Mars.

  • Happy or hungry? Cat purrs send different messages Tue Jul 14, 10:11 AM ET

    NEW YORK - A cat's purr normally says, "I'm happy." But a new study suggests some purrs send cat owners a much different message: "Feed me!"

  • Local residents, schoolchildren and Health Ministry authorities launch a campaign to prevent the spread of the infection by influenza A(H1N1) virus at a primary school in Luque, Paraguay on July 11. The pandemic has grown "unstoppable" and all nations will need access to vaccines, a WHO official has said, as 12 new deaths were reported and a study raised fresh concerns.(AFP/File/Norberto Duarte)
    Study: 1918 flu survivors seem immune to swine flu Mon Jul 13, 7:36 PM ET

    WASHINGTON - The way swine flu multiplies in the respiratory system is more severe than ordinary winter flu, a new study in animals finds.

  • This conceptual artist rendering provided by Rocketplane Global Inc. on Friday July 10, 2009, shows the Rocketplane XP spacecraft. Hawaii could become the eighth state granted a spaceport license. Several space tourism companies, including Rocketplane, have shown interest in coming to Hawaii, said John Strom, vice president of business development for Enterprise Honolulu, the Oahu economic development board. (AP Photo/Rocketplane Global Inc.)
    Space companies eye HI as potential new frontier Sun Jul 12, 4:31 AM ET

    HONOLULU - Tourists coming to Hawaii for high-end getaways could someday be launched from the sand to the stars, taking island-hopping to new heights.

  • In this photo made Tuesday, July 7, 2009, the only verified sample of a giant Palouse Earthworm specimen is preserved in this test tube, as seen at the University of Idaho in Moscow, Idaho. The straight line in the worm segment on the bottom is from a dissection done to study the worm. (AP Photo/Dean Hare)
    Searchers shovel Northwest dirt seeking giant worm Sun Jul 12, 1:45 AM ET

    MOSCOW, Idaho - The giant Palouse earthworm has taken on mythic qualities in this vast agricultural region that stretches from eastern Washington into the Idaho panhandle — its very name evoking the fictional sandworms from "Dune" or those vicious creatures from the movie "Tremors."

  • Steve Lonhart, senior scientist of the Monterey Bay National Marine Sanctuary removes a strand of Undaria, an invasive, fast-growing kelp species at Pier 40 in San Francisco Thursday, July 9, 2009. The invasive kelp from the Far East worries marine scientists because it is outpacing eradication efforts. (AP Photo/San Francisco Chronicle, Stephan Lam)
    Fast-growing kelp invades San Francisco Bay Sat Jul 11, 3:04 AM ET

    SAN FRANCISCO - A fast-growing kelp from the Far East has spread along the California coast from Los Angeles to San Francisco Bay, worrying marine scientists and outpacing eradication efforts.

  • Americans favor science, but less than before Thu Jul 9, 5:36 PM ET

    WASHINGTON - The share of Americans who see science as the nation's greatest achievement is down sharply, even as the public continues to hold scientists in high regard. A new Pew Research Center poll indicates that 27 percent of Americans say the nation's greatest achievements are in science, medicine and technology, more than any category other than don't know.

  • Mysterious tremors detected on San Andreas Fault Thu Jul 9, 2:01 PM ET

    LOS ANGELES - Scientists have detected a spike in underground rumblings on a section of California's San Andreas Fault that produced a magnitude-7.8 earthquake in 1857.

  • A graphic showing the SOI and El Nino since 1990. REUTERS/Graphics
    El Nino conditions return to affect weather Thu Jul 9, 11:24 AM ET

    WASHINGTON - El Nino is back.

  • Professor Karim Nayernia, is seen at Newcastle University and the NorthEast England Stem Cell Institute (Nesci), in Newcastle, England, Wednesday, July 8, 2009. British scientists claimed Wednesday to have created human sperm from stem cells but other experts questioned their data. Researchers at Newcastle University and the NorthEast England Stem Cell Institute say they used a new technique to derive what they described as sperm cells from embryonic stem cells. Stem cells have the potential to become any cell in the body. Newcastle research leader Karim Nayernia said in a statement Wednesday that the technique would allow researchers to study how sperm develops and possibly help develop treatments for infertile men. (AP Photo/Scott Heppell)
    British scientists claim to create human sperm Thu Jul 9, 1:10 AM ET

    LONDON - British scientists claimed Wednesday to have created human sperm from embryonic stem cells for the first time, an accomplishment they say may someday help infertile men father children.

  • Organ transplant drug extends life of older mice Wed Jul 8, 2:53 PM ET

    WASHINGTON - A drug used to prevent the rejection of organ transplants was found to significantly increase the life span of older mice, researchers report. The National Institute on Aging is testing compounds that may extend the life span of mice. The drug rapamycin is the first to work for both male and female mice, according to a study published online in the journal Nature.