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Human fetal tissue long used for variety of medical studies

Scientists have long used human fetal tissue for research; stem cells haven't replaced it yet

2 injection wells shut down after Oklahoma quakes

2 injection wells shutting down, 1 reducing activity after earthquakes in northern Oklahoma

Spaceship pilot describes harrowing free fall after breakup

Pilot describes free fall from miles above California desert after SpaceShipTwo disintegrated

Oklahoma day care closes after reports of sunburned children

Oklahoma day care closes doors after mother reports her 2 children severely sunburned

Panel scales back new oil rules for North Dakota reservation

Tribal panel eases additional oil drilling regulations on part of North Dakota reservation

US expects to pay farmers $191 million for birds lost to flu

Vilsack: US cost to pay farmers for dead birds in bird flu outbreak expected to reach $191M

Planned US ivory rules not fazing California Chinatown shops

In San Francisco, a hub of ivory sales, sales of tusks flourish ahead of proposed US crackdown

Critically endangered northern white rhino dies at Czech zoo

Female northern white rhino Nabire dies at Czech zoo, only 4 others are now left in the world

French archaeology students find 560,000-year-old tooth

French archaeology students find 560,000-year-old human tooth in major prehistoric site

Scientists worry about arms race in artificial intelligence

Scientists and tech gurus warn of arms race in 'killer robots' using artificial intelligence

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Scientist: Whale deaths off Alaska island remains mystery

Scientist says unexplained mass whale deaths off Alaska island may remain a mystery

Magnitude 4.5 and 4.0 earthquakes recorded in Oklahoma

US Geological Survey records magnitude 4.5 and 4.0 earthquakes in central Oklahoma

Correction: Lake Michigan Shipwreck story

Correction: Lake Michigan Shipwreck story

Stephen Hawking fields questions on artificial intelligence

Renowned physicist Stephen Hawking fields questions on artificial intelligence on Reddit

Canceled Utah race renews fears of shrinking salt flats

Another canceled Speed Week renews racers' fears that Utah's famous salt flats are shrinking

Half of Columbia River sockeye salmon dying due to hot water

Half of Columbia River sockeye salmon population dead or dying due to warming water in basin

Planned Parenthood official says no profit from fetal organs

Planned Parenthood president says group doesn't profit from fetal organ research

Endangered butterfly recovering in some, not all, of range

Endangered Karner blue butterfly nears recovery goals in New York; outlook poor in Indiana

Rarely-seen whale washes up on Massachusetts beach

Biologists to study carcass of rarely-seen whale found washed up on Massachusetts beach

Judge rules Alzheimer's project belongs to UC San Diego

Judge rules control of landmark Alzheimer's research project belongs to UC San Diego

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Deep-sea mining looms on horizon as UN body issues contracts

Dawn of deep-sea mining alarms conservationists as UN body issues exploration contracts

Conditions on Pluto: Incredibly hazy with flowing ice

Conditions on Pluto: Incredibly hazy with flowing ice similar to glaciers on Earth

Mystery beach blast in Rhode Island blamed on hydrogen gas

Mysterious beach blast in Rhode Island blamed on combustion of hydrogen gas buildup

1 of oldest African elephants in North America euthanized

1 of the oldest African elephants in North America euthanized at California sanctuary

Ex-UN climate panel head accused of stalking loses India job

Former UN climate panel chief accused of sexual harassment loses job at India energy institute

Deepsea Challenger sub damaged in truck fire

Deepsea Challenger, which visited deepest spot in world's oceans, damaged in truck fire