Q. I saw on TV that a girl died from drinking too much water. How is that possible?
— Clarice Lightning grade eight Sennett Middle School
A. The human body is more than 50 percent water — it fills our cells, shuttles ions and nutrients, and clears out waste products. With so many crucial jobs, body fluid levels are very tightly regulated, says Dandan Sun, a UW-Madison professor of neurosurgery and physiology.