Rattlesnake are a group of poisonous snakes of the genera Crotalus and Sistrurus of the subfamily Crotalinae (vipers). The scientific […]

Rosa Louise McCauley Parks (February 4, 1913 – October 24, 2005) was an American activist of the civil Rights movement […]

The π (/Paque/) number is a mathematical constant. Originally defined as the relation of the circumference of a circle to […]