January 20 is usually Inauguration Day in the United States – but it is an off year.  So, what cool things happened today in science history?  Well, in 1974, the US Post Office honored Elizabeth Blackwell, America’s MD, with a stamp.  Astronomers announced the first optical pulsar in 1969. And in 1885, the first patent for a roller coaster structure was issued to La Marcus Thompson of Coney Island, NY.  So, how about some roller coaster science?

The best site, I have found is on Science Buddies – http://www.sciencebuddies.org/blog/2012/06/roller-coaster-science-marbles-tubes-and-loops.php. Enjoy!