For most people, sensing temperature is second nature. You grab a hot cup of coffee and instinctively pull back if it's too warm. You touch a cold glass of water and immediately register the chill.

The practice sounds almost medieval in its simplicity: alternating between hot and cold temperatures to heal the body. Yet temperature contrast therapy, switching between heat exposure and cold ...

This experiment demonstrates how water at different temperatures has different densities, creating beautiful layering effects. You'll see how warm and cold water interact and learn about density ...