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The mushroom cloud from the US "Castle Bravo" nuclear test in 1954. A 15 megaton explosion was set off on Bikini Atoll in the Pacific. (US Department of Energy)
Experts think that if North Korea is not yet able to put a powerful warhead on a missile and deliver it to the U.S., they will soon.
Bacteria living inside cancer tumours can actually eat chemotherapy drugs
Physicist Max Tegmark explores how we'll co-exist with intelligent machines
Despite extreme weather events like Harvey and Irma, Americans generally don't connect the dots regarding climate change.
Neanderthals made glue from birch bark to keep their stone tools together two-hundred thousand years ago.
The eclipse started on the west coast, and ended on the east coast - why?
As It Happens
'Disturbed and violated': Canadian mother and son fall victim to Equifax hack
George Clooney says Harvey Weinstein allegations must lead to change
White supremacy during Obama era helped Trump become president: Ta-Nehisi Coates
Gord Downie's brothers on feeling the nation's grief: 'This country weighs a lot'