Video

Astronomy

What kinds of black holes exist — and how are they different?

Scientists have identified four types of black holes, classified mostly by their masses. But these mysterious objects continue to challenge our understanding of the universe.

Life

The natural history of every U.S. state is on display at a new D.C. exhibit

The Smithsonian Natural History Museum’s latest exhibit, “From These Lands,” connects visitors with America’s natural history.

Plants

Check out 6 ways orchids use tricks to reproduce

This spring, these six orchids will lure pollinators with mimicry, scent or other unusual strategies.