Latest Lesson
How to Sight Along a Water Level
Bob explains how to align near and far markers and detect small departures along a sightline. Careful alignment and recorded measurements a...
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Puzzle through an ethical dilemma and decide: what responsibility do we have to honor the wishes of the dead? -- For decades, Yvonne and Z...
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A long, long time ago, Earth was home to one giant super continent. So, what happened? In this episode of Crash Course Geology, we’ll break...
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Sharpshooter insects make a living hopping around plants like grapevines and feeding on their sap. When it's time to mate, they shake t...
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