Sumerians: Keeping cool together. The Sumerians lived about 6,000 years ago in a hot and dry climate that is now southern Iraq. Even then, they had techniques for managing the heat.

Forget hot hikes – this Columbia gear is designed to keep you cool as a cucumber; 5 common hiking injuries (and how to prevent them) 5 signs it’s time to turn back on your hike; 1. Be an early ...