In the recent hot weather, some people have been succumbing to heat stroke and heat exhaustion. Daniel Engber on Slate.com has an Explainer to tell you how heat does this [How does heat kill you? By Daniel Engber MP3]

Stay cool, drink plenty of water, wear a hat, oh, and if you're in Mexico, and your Government is encouraging you to cross the border illegally through the Sonoran Desert, stay home.