[Free Registration/Login may be required to access all resource tools.] This study guide summarizes key points about electromagnetic radiation and the different types of telescopes that rely on various forms of it. Includes a few...

Biography of Galileo Galilei (1564-1642), one of the most famous scientists and inventors of all time. He is best remembered for his invention of the telescope, which caused him to question the contemporary belief that the Earth was the...

Working in teams of "engineers", learners explore how a periscope works and is used. They design, build, and test a working periscope made from everyday materials that has adjustable mirrors and be able to telescope as well.