European trade goods (thanks to Nebraska Game and Parks Division) North American people made rapid scientific advances in the course of the 1500s AD, inspired by contacts with traders and [...]
A Japanese girl who lost her hair from radiation sickness from the atomic bomb Americans dropped on Hiroshima Some atoms are naturally radioactive, especially atoms of uranium and plutonium. These atoms have so many [...]
Radiation from the sun caused this sunburned back The most common kind of radiation is sunlight, and the most common cause of injury from radiation is a sunburn. Just like radioactivity from a [...]
Rocky Mountains Some Native people don't agree that their ancestors came originally from East Asia. These Native American people believe that their ancestors were always in North or South and Central America. There's no [...]
Vedic India: A horse-drawn chariot from the Oxus Treasure (British Museum, thanks to Mary Harrsch) About 1500 BC, a new group of people seem to have come to India from the [...]
A model of the amino acid molecule glycine (red is oxygen, black is carbon, yellow is hydrogen, and blue is nitrogen atoms) What are amino acids? Amino acids are molecules made [...]
Diagram of a phosphorus atom Phosphorus atoms have fifteen protons and sixteen neutrons, so they're just a little lighter than sulphur atoms, in the middle of the range for atoms. [...]
Diagram of a nitrogen atom Inside a red giant star, the star smashes lighter atoms together. Smashing atoms gets the star energy to burn, and also leaves extra heavier atoms. Nitrogen [...]
The virus that causes AIDS (greatly magnified) HIV image copyright Russell Knightley Nobody is quite sure whether viruses are living things or not. The first living things may have come [...]
A mutated snake with two heads With all these new molecules like lipids, amino acids, RNA, and protein floating around in the oceans by around four billion years ago, there [...]
