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America's sixteenth president, Abraham Lincoln (February 12, 1809 - April 15, 1865) is revered for ending slavery, and preserving the Union by winning the Civil War. But perhaps he is best known for his Gettysburg Address of 1863 and being the first assassinated U.S. president. Learn more at these top Lincoln sites.

The Kids' Science Challenge is a national (United States) contest for students in grades three through six. The challenge asks students to innovate and build upon on our current conceptions of how things work. There are three areas of innovation in this year's contest; reducing waste, developing meals to be eaten on Mars, and developing a toy or game that demonstrates an animal's intelligence. The contest is open until February 29, 2012. Applications for EducationTo help students start thinking about the topics in The Kids' Science Challenge, the challenge website has a series of games and videos for students. For teachers, The Kids' Science Challenge offers a page of lesson plans and hands-on activities designed to help students develop ideas related to the contest's three challenge topics.