Most of us can expect to slow down as we age. But we all know a few people who stay sharp well into their 80s or even 90s. Chicago-area scientists think those people might have lessons for the rest of us about how the brain works, and why it sometimes breaks down.
A chunk of Mifflin, the meteorite that lit up the sky in April (photo by Jim Holstein, The Field Museum)The meteor news just don't quit. Back in April reports flooded in from around the Midwest about a massive fireball lighting up the night sky.
Mark Hammergren, of the Adler Planetarium, dispenses pretty quickly with the idea that a comet could have caused the Great Chicago Fire. But he's quick to bring up a different episode, 100 years ago, when a comet fragment may indeed have scorched the earth.