 Support for NPR comes from NPR stations. Other contributors include Procter & Gamble, maker of Z-Quil Pure Z's Gummies, designed with melatonin for occasional sleeplessness to help people fall asleep naturally. Learn more at zquil.com. This is NPR. Good morning. This is KUNR. You're listening to Morning Edition, and I'm Michelle Rivera with you on this 4th of July.