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What's the longest someone has been clinically dead — but then come back to life?

When someone's heart stops beating, their brain cells start dying within minutes. But sometimes, they can still come back ...

What is pneumonia, the lung infection that caused Diane Keaton's death?

While it wasn't clear whether Keaton had any underlying conditions, doctors say "perfectly healthy" people can die from ...

KISS guitarist Ace Frehley dead at 74 after suffering brain bleed

Original KISS singer and lead guitarist Ace Frehley has died at age 74 after reportedly falling in his studio and suffering a ...

Ace Frehley brain bleed: What to know about condition that put KISS guitarist on life support

Ace Frehley the original lead guitarist for KISS is reportedly on life support after suffering a brain bleed. Frehley is in ...

Behind the race to detect — and treat — brain disease CTE before it kills

The gunman who unleashed chaos in a Midtown Manhattan skyscraper this summer is a stark reminder of how little we know about ...

'Death fold' proteins can make cells self-destruct. Scientists want to control them

Scientists are hoping to treat diseases including cancer and Alzheimer's by influencing how cells make life-or-death ...

What happened to Ace Frehley? Here's the latest on the Kiss star's health struggles

Kiss founder Ace Frehley, 74, canceled 2025 tours after a studio fall; TMZ reports he's on life support with a brain bleed, ...