How are chemical reactions affected by gravity? Learners explore the phenomenon of effervescence as part of the Christa's Lost Lessons series. They compare findings in an experiment on effervescence to a video of a similar experiment in...

Introduce your class to the Everest expedition to reenact a 1924 climb by George Mallory and Andrew Irvine. Discuss and show pictures of the types of clothing worn at that time and compare it to today's state-of-the-art climbing gear....