Ellsworth Huntington

Today, no less than in the past, the tetrahedral form of the earth and the relation of the tetrahedron to the poles and to the equator preserve the conditions that favor rapid evolution.

American Educator

Understand that 'tetrahedron' refers to a precise mathematical shape, not any four-faced object.

Mathematical Concept

While tetrahedrons resemble pyramids, they precisely have four triangular faces, unlike some pyramids.

Not Always Pyramid

A regular tetrahedron has equal sides; irregular ones don't, but both share the four-face characteristic.

Regular vs. Irregular

 attached to a central carbon, as an example. Drawn on paper, it's just a still tetrahedron. But in real life, it's a jiggling mess. The kinetic energy of molecules is exactly the same type of energy as the energy you have when you're moving around, except that you can be still and molecules can't.

Where does energy come...

 They always make a triangular roof. Now this is people science. And if you were to just poke a hole over here and put a third matchstick, you'll get a T joint. And if I were to poke all the three legs of this in the three vertices of this triangle, I would make a tetrahedron.

Turning trash into toys...

 components to it so there's a tetrahedron module which is this and there's octahedral modules which is this and so from the island that I could actually create a wall in clay if I just mimic its actual molecular structure and so I started sort of playing around the

Tetrahedron

Mathematical Concept

Not Always Pyramid

Regular vs. Irregular

Never forget "Tetrahedron"

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