Hypnotics are pills that are primarily used to induce sleep.
Insect blood is green, and gets its color from the plants it eats.
Rage and aggression are hardwired in our brains as a survival instinct.
All land vertebrates evolved from fish, and Acanthostega—the fossil of a part-fish, part-amphibious creature—pinpoints how we made the leap from water to earth.
People like robots that act like humans but only up to a certain point.
Spinach may have done the trick for Popeye, but it doesn't add muscle to the rest of us.
The brains of men and women do not differ based on gender.
Like its Roman-god namesake, Mercury is known for extreme behavior.
The bombardier beetle is aptly named: It fires toxic chemicals that, when released, sound like a bomb detonating.
Global warming is depleting oxygen in the water, creating and expanding "dead zones" toxic to sea life.