Keeping cool during the hottest months of the year isn’t just a matter of comfort—it can also be life-saving. Heat stroke and exhaustion strike millions of people each year, and their effects can be deadly. Even if you have central air conditioning in your home, activities like exercising and cooking can raise your temperature fast and put you at risk. And of course, outdoor activities like gardening, walking and running put you at tremendous risk on hot days. Here are a few tips for keeping cool this summer indoors and out so that you stay comfortable and reduce your risk of a heat-related illness.