Meet Charles Darwin, the man responsible for the theory of evolution and many other revolutionary scientific discoveries.

Children learn to use the "Somebody Wanted But So Then" method to write a short summary in this literacy worksheet.

Learn about Carl Sagan, an American astronomer, cosmologist, astrophysicist, astrobiologist, and author.

Trace the steps behind a natural phenomenon with this third- through fifth-grade cause-and-effect reading worksheet!