0211 Magnets

Dark matter distribution. Image 3 of 4. Supercomputer simulation, known as the Millennium Run, showing the distribution of dark matter in the local universe. The frame is 63 megaparsecs (206 million light years) in distance across. Dark matter is a form of matter that cannot be detected by telescopes as it emits no radiation. It is thought that cold dark matter first formed after the Big Bang. This matter then collapsed under its own weight to form vast halos (bright yellow) which sucked in normal matter to form visible matter, such as galaxies. This simulation was created in 2005 by the Virgo Consortium of international scientists using supercomputers at the Max Planck Society, Germany. For complete sequence, see images R980/209 - R980...

Alexander of Macedon (left, 356-323 BC) and Aristotle (right, 384-322 BC), the Ancient Greek philosopher and naturalist. Aristotle, a member of the Macedonian aristocracy, spent nearly 20 years at Plato's Academy in Athens. He returned to Macedon in around 342 BC and taught the young prince rhetoric, literature, science, medicine, and philosophy. Alexander would later conquer most of the known world as Alexander the Great. Artwork from the 19th century book Vies des Savants Illustres.

the flow of the wind.