Can ancient hacks beat modern heat?

Ancient Chinese strategies for managing summer heat offer practical, low-tech alternatives to modern energy-intensive cooling methods. Historical practices included storing ice harvested from frozen rivers in underground cellars and constructing "cooling palaces" in mountainous regions to escape urban heat. A unique, science-backed method involves hugging a large wax gourd, which remains significantly cooler than room temperature due to its high water content. Beyond historical cooling techniques, proper sunscreen maintenance is essential for effective UV protection. Cosmetics like sunscreen generally remain effective for up to three years if stored in cool, dry places away from direct sunlight. Signs of degradation, such as changes in color, texture, or separation of ingredients, indicate that a product should be discarded. Consistent daily application, regardless of weather, remains the most effective way to prevent skin aging and damage.