Heliocentric vs. Geocentric
If you did this 100 years ago you would be burned for being a witch.
Find an excuse to go shooting and call it science.
Inertia is a powerful force. Stronger than gravity.
If you don't know what you are doing, don't wing it when towing.
It looks like some solar systems and planets would get launched out into space at some terrific speeds.
Modeling 90Degrees in curved space.
A nice visualization of stars.
How knees work
How plants can save a beach from erosion
Visualization of Cell Mitosis
Who would think that water doesn't just instantly absorb itself?