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SciShow
Graphene: The Next Big (But Thin) Thing
If you haven't heard of it before, you have now. And it may prove to be the next big thing in materials science. SciShow explains what it is, why it's so awesome, and what challenges we face in harnessing its amazing properties.
Guinness World Records
Most Rotating Puzzle Tetrahedrons Solved Underwater
The most rotating puzzle tetrahedrons solved underwater is 9, and was achieved by Chinmay Prabhu (India) in Mumbai, India, on 9 December 2018.
Sophia Learning
Sophia: Volume of a Tetrahedron: Lesson 1
Given this lesson and the formula, you'll be able to calculate the volume of a tetrahedron. It is 1 of 5 in the series titled "Volume of a Tetrahedron."