 Take extra precautions when outside. Wear lightweight and loose-fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. Support for NPR comes from the station and from Fisher Investments. Fisher's dedicated team of specialists provide resources on investing, retirement income, estate planning, and more. Learn more at fisherinvestments.com. Investing in securities involves the risk of loss.