Avoid heat stroke by staying hydrated.

Lon Horwedel | file photo

Here's a look at some of the top health news being talked about around the U.S. and the world today:

• It's been positively baking outside in Michigan this week with bright sunny skies and prolonged high temperatures and heat indexes in Washtenaw County and elsewhere. And it's more important than ever to stay well-hydrated. 

It might seem like common sense, but the danger is real for folks of any age to suffer heat stroke and heat exhaustion, according to an article in the Times Herald in Pennsylvania.

Do you know the signs of a heat stroke?

• Extremely high body temperature (above 103 degrees)
• Red, hot and dry skin
• An inability to sweat
• Rapid, strong pulse
• Throbbing headache
• Dizziness
• Nausea
• Confusion or unconsciousness

• More Americans need to be screened for breast and colon cancer to prevent more cancer deaths, according to the U.S. Centers for Disease Control. The story was reported in the Wall Street Journal.

• A later school start time would help more high school students get eight hours of sleep nightly, experience less irritability or depression and perform better in school, researchers found, according to a Los Angeles Times blog.

Tina Reed covers health and the environment for AnnArbor.com. You can reach her at tinareed@annarbor.com, call her at 734-623-2535 or find her on Twitter @TreedinAA.