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Conflicting eyewitness accounts have led to many possible scenarios for who killed Manfred von Richtofen, also known as the Red Baron, during WWI. Here, examine some of the most famous and likely competing theories.
OPPORTUNITY EXPLORES FOR 14 YEARS DISCOVERS EVIDENCE OF ANCIENT FLOWING WATER NARRATOR: Over 50 years of Mars exploration has revealed intriguing clues, suggesting Mars has a surprisingly watery past. ASHWIN VASAVADA: There’s a lot of evidence for ancient flowing water on Mars. For one thing, there’s a lot of rivers that once coursed across the surface that are now dry, today. There’s also evidence for floods that catastrophically scoured the surface. JOHN GROTZINGER: It’s undeniable that the early history of Mars was much wetter than it is today. STEVE SQUYRES: The surface of Mars is...
PBS Airdate: February 6, 2007 NARRATOR: 1939: A chemist at a midwestern paint company makes a startling discovery, one that could improve the health of millions of people. The company wants him to stick to making paint, but this man has always gone his own way. He was the grandson of Alabama slaves, yet he went on to become one of America's great scientists. HELEN PRINTY (Julian Laboratories Chemist) : He had to fight to overcome the odds of being a black man in America. JOHN KENLY SMITH (Historian) : The chemical world was a club, and outsiders were not really all that welcome. PETER WALTON ...
Cave Paintings and Sculptures A map of decorated caves in western Europe with the names of a few notable or outlying sites. The broken line encloses caves decorated in the distinctive 'Mediterranean Style' which seems to have been little influenced by the master artists of France and Spain. It often features simple, stark animal representations together with quite elaborate geometrical designs. There are important caves decorated in the Mediterranean style in southeast Spain, the Ardèche canyons in southern France, the heel of Italy, and in Sicily. There are now some 200 Painted caves know...