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How California's improving air quality is putting a dent in the region's dangerous fog

Why this hive of honeybees is doing 'the wave'

NASA's InSight lander captures intimate sights and sounds of Mars

Do we still need daylight saving time?

Skipping sleep is bad for your brain, your DNA and your social life

7 superlative flying animals

Drone reveals 'extinct' Hawaiian flower growing on remote cliff

Synchronized fireflies gather for a 'rave' in the Great Smoky Mountains

The bittersweet beauty of Greenland's melting glaciers

Going green when it's your time to go

Bobcat displaced by California's Woolsey Fire gives birth to 4 kittens

15 weird medical treatments that we used to think worked