Doctors Warn: Heat Can Kill

Patrick Stewart was a famous actor. He was in "Star Trek" and "X-Men". He died on Wednesday. He was 86. His family says he had two brain illnesses. One is called Lewy body dementia. Dementia hurts the brain.

Many people want to walk 10,000 steps a day. Two studies say fewer steps can help the brain. In one study, about 300 older people counted their steps. Some walked 3,000 to 7,500 steps a day.

A young woman died in Russia. She worked in a lab. The lab studies plague, a very bad illness. Some news stories say she had plague. Russia says this is not true. The WHO is a world health group.