While it's readily accepted that the Earth is getting warmer, scientists continue to disagree about what that really means. Learn more about the greenhouse effect and how it impacts Earth.
All living things evolve over time in order to adapt to their environment. Meet some of the world's craftiest survivors, and learn how they have adapted to their surroundings.
Bacteria are single-celled organisms with the ability to help and harm other living things. Viruses can reproduce only in host cells, often causing infections.
The brain, nerves, and spinal cord work together in the nervous system to form your experience of the world and lead the other body systems to success.