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It's a mystery how butterflies manage to make their brilliant wing colors, but Yale physicists got a glimpse when they took the question to the lab, breeding dull brown butterflies into purple ones.

Arizona's largest hospital system is nearing ICU bed capacity as coronavirus cases surge. Will Humble, the state's ex-health chief, urges a new executive order requiring Arizonans to wear face masks.

Reports indicate Trump ordered Kushner’s security clearance, despite concerns

The top library books people tried to ban or censor last year

Amy Klobuchar on her top 3 priorities as president

California begins recovery efforts as storm damage tops $1 billion

Frances Tiafoe shares rollercoaster journey to becoming one of tennis's top players

Why was a top federal vaccine expert forced out of his job?

Global death toll tops 100,000 as Trump speaks of reopening the economy

Taiwan’s top diplomat in Washington discusses U.S. relations and tensions with China