AP Video - Science and Technology

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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!" (July 14)

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Experts in Tokyo on Sunday finished assembling a replica of what they claim is the world's biggest dinosaur skeleton. (July 13)

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Commuters in New York City are in for a surprise Friday, when new rail cars officially hit the tracks of the PATH train system for the first time in more than 20 years. (July 10)

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New reports suggest that consumers know less about expensive bottled water than what comes out of the tap for free. (July 8)

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Plans for the world's largest wind farm in the Texas Panhandle have been scrapped and energy baron T. Boone Pickens says he's now looking for a home for 687 giant wind turbines. (July 7)

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Migaloo, the rare all-white humpback whale, was spotted swimming off the Queensland state on Wednesday as it migrated up the Australian coast. (July 1)

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A top NASA official is touting a replacement for the Space Shuttle program that would be much cheaper than the planned $35 billion Constellation program. (June 30)

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The world's smallest machines are competing on the world's smallest "soccer field" to demonstrate the abilities of nanobots. (June 29)

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HTC has launched the HTC Hero, an Android-based phone that promises to be more personalized. (June 25)

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It's been said that you can't judge a book by its cover. How old that saying is is anyone's guess, but a 2800 year-old mummy is proving the old adage true. (June 24)

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A professor starts a year-long test of BMW's new electric MINI E; A car that can go 100 miles on a single charge. (June 23)

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Google has teamed up with the University of Pennsylvania to showcase the campus in the Web site's Street View section. (June 19)

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NASA has launched its first moon shot in a decade. It's a first step in NASA's effort to return humans to the moon by 2020. (June 18)

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AT&T will allow some current iPhone owners to upgrade to a new model at the same price as new buyers when it is released Friday. (June 16)

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For the second time in less a week, a hydrogen gas leak on shuttle Endeavour's fuel tank early Wednesday forced a launch delay, pushing its space station construction mission into July. (June 17)

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In Florida, state officials have licensed a company to use a procedure designed to zap oysters with a small dose of radiation. (June 15)

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According to news reports, the Israeli military has developed a "robotic" snake that can transmit video and audio as it crawls through difficult terrain. (June 15)