What Happened in 1493

Leonardo da Vinci Sketches the Design for the "Aerial Screw"

The first studies on helicopters were well in advance of the first airplanes. Leonardo da Vinci is credited with having first thought of a machine... Read more

Christopher Columbus Arrives In Puerto Rico

When Christopher Columbus arrived in Puerto Rico during his second voyage on November 19, 1493, the island was inhabited by a group of Arawak... Read more