Caspian SeaNov. 4, 1966: Record flooding inundates the city of Florence, Italy, causing extensive damage to Renaissance artwork and centuries-old buildings. A week of heavy rains had pushed the Arno River out of its banks. On the night before, workers at an upstream dam, fearing its total collapse, released a huge torrent of water into the Arno, adding to the flood levels in Florence. 

Nov. 4, 1974: The first test flight of a solar-powered plane takes place at Edwards Air Force Base in California. The pilotless plane, designed by Robert Boucher, makes a short but successful flight.

Nov. 4, 2003:  Iran, Russia, and three former Soviet republics sign a treaty to protect the Caspian Sea. The Sea is the focus of intensive oil drilling, and is home to over 400 species found nowhere else in the world.

Photo: Wikimedia Commons

This feature is compiled by Peter Dykstra, an MNN contributor and publisher of Environmental Health News and The Daily Climate.

The opinions expressed by MNN Bloggers and those providing comments are theirs alone, and do not reflect the opinions of While we have reviewed their content to make sure it complies with our Terms and Conditions, MNN is not responsible for the accuracy of any of their information.