Oceans became saline hundreds of millions of years ago as rainfall mixed with sodium from the Earth's crust.
Split ends are a common enough hair complaint, but do you know what precisely is splitting, and how, and why? In order to answer these questions and more, a quick hair anatomy lesson. Learn more on this Moment of Science.
How clean is the average backyard pool is? Find out on this Moment of Science.
“Bloodshot” is precisely the right term to describe what happens when something irritates the eyes.
If you’ve ever seen movies about World War I, you know that the soldiers in the trenches often wore bulbous gas masks that made them look like human insects. The masks were necessary to protect them from chemical weapons such as chlorine gas, a noxious substance that could almost instantly suffocate unprotected victims.
Since the charcoal filter can’t absorb all chemicals, the last filter uses chemical reactions to clean the air. Say I’m breathing in chlorine-saturated air, like soldiers during World War I.