Brain
Warning! Nicotine poses special risks to teens
Even a single dose of nicotine during early teen years can start a life-long cycle of nicotine use and addiction.
Word of the Week
Animals
Scientists Say: Primate
Primates are mammals that tend to have big brains, forward-facing vision, fingernails and flexible hands and feet.
Explainers
Space
Explainer: All about orbits
A handful of rules can describe the route some object repeatedly takes around another in space. Calculating that path, however, can be quite complex.
Technically Fiction
Animals
Monstrous mammals would break the body rules
Giant mammals and people thunder through our movies and books. But real mammals can only get so large before they can’t take the heat.
What's Hot
En Español
Watch This
We finally have an image of the black hole at the heart of our galaxy
New observations from the Event Horizon Telescope reveal the chaotic region around the Milky Way’s central black hole, Sagittarius A*, in extreme detail.
