TED Talks
Ted: Ted Ed: Sex Determination: More Complicated Than You Thought
There are vastly different systems of sex determination among animal life on earth. In this TED Ed presentation biologist, Aaron Reedy, shows us the incredible differences between species when it comes to determination of gender. [5:46]
ClassFlow
Class Flow: Tornados in the Us
[Free Registration/Login Required] Overview: In this lesson, students will learn the basics about how tornadoes are formed, and when and where they are most likely to occur. They will learn that the United States is the country most...
![Nasa: Introduction to Clouds [Pdf] Graphic](https://static.lp.lexp.cloud/images/attachment_defaults/resource/large/FPO-knovation.png "Nasa: Introduction to Clouds [Pdf] Graphic")
NASA
Nasa: Introduction to Clouds [Pdf]
NASA is interested in clouds because they are an integral part of the water cycle, and because they are a controlling factor in the energy budget of the Earth. This chart provides a basic introduction to the identification of clouds. The...
Massachusetts Institute of Technology
Mit: Open Course Ware: Hands on Astronomy: Observing Stars and Planets
A university-level course in basic observational procedures in astronomy. Covers how to use a telescope, and includes lecture notes.
Massachusetts Institute of Technology
Mit: Open Course Ware: Gps: Where Are You?
A basic course from MIT on how a Global Positioning System(GPS)works, and the many new applications for using it. Includes lecture notes and assignments.