Aging

How long can humans live?

The longest-lived person was Jeanne Calment of France. She died on August 4, 1997, aged 122 years, five months. But she’s unlikely to hold it for much longer.

Emergency Preparedness

How Disaster Warnings Can Get Your Attention

Harnessing new prediction technology, federal authorities hope to sharpen the disaster warnings they send directly to cellphones, as well as to state and county emergency managers, to make the warnings faster and clearer about life-threatening conditions