Lack of evidence put Hawking's Nobel hopes in black hole
Stephen Hawking: 'His laboratory was the universe'
Washington state moves to protect endangered killer whales
A life: Hawking defied ALS to become pre-eminent physicist
New nickname for Pluto-explorer's next target: Ultima Thule
Star Wars? President Trump proposes military space force
Skulls show women moved across medieval Europe, not just men
National Geographic acknowledges past racist coverage
Fertility-clinic breakdowns baffle experts, upset couples
UK says ex-spy poisoned with Soviet-developed nerve agent
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