The source for most of these are confounding statistics. My favorite being that a deck of cards can shuffle into such a vast number of options, more than grains of sand on earth.
Another good one I like is that there are about ten times more bacteria cells in your body than human cells. But they are so much smaller they are only about 5 pounds of your total mass.
Also one most people get wrong and makes me sad. The seasons on Earth are not caused by the rotation of the earth around the sun, nor it's elliptical orbit. They are caused by the tilt of the earth's axis and the time of year the Earth is closest to the Sun it is actually winter in the northern hemisphere.
The deck of cards thing is a truly insane stat. It’s not just more unique shuffles than grains of sand on Earth; there are more unique ways to shuffle a deck of cards than there are atoms in the Milky Way.