Monthly Archives: February 2023

Triple EVA

John F. Lindner February 16, 2023 11:15 PM

Since the mid 1960s, all space walks or extra-vehicular activities (EVAs) have involved just one or two astronauts — except once. In May 1992, on the STS-49 mission, the crew of the space shuttle Endeavour was attempting to rescue a stranded communications … Continue reading →

Posted in Adventure, Space Exploration | Leave a comment

5-Color Theorem

John F. Lindner February 5, 2023 1:48 PM

On 1852 October 23, Francis Guthrie noticed that he needed only 4 colors to color the counties of England so no two bordering counties shared the same color. This works for any map, but only in 1976, and with the aid of … Continue reading →

Posted in Mathematics | Leave a comment