Can ancient hacks beat modern heat?

We are in the thick of summer, cranking the AC and reaching for anything cold. But for thousands of years, people survived blazing heat without a single modern convenience. China's traditional playbook was full of clever, low-tech fixes that kept things bearable. As temperatures keep rising, can these ancient hacks actually be smarter than our energy-guzzling gadgets? / Can you wear last year's sunscreen (12:29)? On the show: Steve, Fei Fei & Yushan