Belugas swap mates for survival, and more…

Researchers made the surprising discovery that Alaska beluga whales have swinging sex lives — and that could be their key to survival in the warming Arctic. Plus: mission to the 'doomsday' Thwaites glacier in Antarctica ends in disappointment near-infrared light therapy offers hope to football players with brain injuries with nuclear power making a comeback, what's changed since the last Atomic Age?