10 things you may or may not know about Earth...

1) The Earth is smoother than a billiard ball.

2) The Earth is an oblate spheroid

3) The Earth isn’t an oblate spheroid.

4) OK, one more surfacey thing: the Earth is not exactly aligned with its geoid

5) Jumping into hole through the Earth is like orbiting it.

6) The Earth’s interior is hot due to impacts, shrinkage, sinkage, and radioactive decay.

7) The Earth has at least five natural moons. But not really.

8) The Earth is getting more massive.

9) Mt. Everest isn’t the biggest mountain.

10) Destroying the Earth is hard.

Ok so have I got your attention? You can check out the explanations to all 10 here and

But remember the main point here: you live on a planet, and you may not know all that much about it. The only cure for that is learning, and that’s driven by wonder. Keep wondering, and keep learning. And don’t forget to look around.

-Phil Plate (the "Bad Astronomer")