Chris R's Enrolled Lessons
4 minAstronomy lesson3 CQ
Pluto was known as the smallest planet in the solar system. Learn why Pluto was "demoted" to the classification of dwarf planet in this astronomy lesson.
2 minFREESTEM Nerdy CurioFree2 CQ
Today's Nerdy Curio is brought to you by 60-Second Science. Light tuned to a specific frequency warms ice more than water—which could come in handy for defro...
7 minFREEHumanities Worldly CurioFree4 CQ
Polish-born American revolutionary hero Casimir Pulaski is the namesake of many sites across America. But questions have always lingered about his burial. Wh...
5 minAstronomy lesson3 CQ
In this lesson, learn about gravitational waves, including who predicted them, how they were detected, the different types, and how they can be used.
4 minFREEHumanities Worldly CurioFree3 CQ
Videos and photos of a striking woman leading a group of protesters in Sudan has gone viral on social media. But what is it about this image that makes it so...with PRI's The World
Videos and photos of a striking woman leading a group of protesters in Sudan has gone viral on social media. But what is it about this image that makes it so...
6 minScience lesson4 CQ
In this astronomy lesson, learn about the process of finding another Earth, and review the best exoplanet candidates that have been discovered thus far.
8 minFREEOutdoors lessonFree5 CQ
Before you start tying bowlines, figure eights, and monkey’s fists, learn about several common rope materials and knot types in this introductory lesson.
16 minOutdoors lesson9 CQ
In need of a safe and secure loop? This lesson shows you how to tie several loop knot variations, from bowlines to sporting and rock climbing loops.
4 minOutdoors lesson3 CQ
End knots are indispensable for securing rope used in blocks and pulleys. This lesson shows you how to tie the figure eight and the threefold overhand.