How Do Spiders Walk on Water — And What Makes Fluids Stick Together?

Imagine a pond as a giant trampoline made out of invisible strings. When you put your foot on it, the strings pull together to support your weight. Spiders are like tiny gymnasts who use these hidden strings, called surface tension, to walk across water! Surface tension is what makes water hold together at its surface, and spiders have special hairs that help them grip this invisible trampoline.