Anitediphobia: The fear that somehow, somewhere, a duck is watching you.
The fun fact that you eat about 8 or so spiders a night is not actually a fact, but a falsehood perpetrated by a scientist for an experiment to see how quickly information travels around the world.
"Magic numbers" is an actual technical term in nuclear physics. These magical numbers are the numbers of nucleons that make up extremely stable nuclei. Nuclei with more or less nucleons are less stable until the next magic number is reached.
Water expands when frozen. This is due to the structure of the H2O molecules that causes them to have intermolecular bonds strong enough to form a sort of crystal structure when the temperature becomes low enough.
Lukewarm water freezes faster than cold water. While apparently a fact I do not know the background behind it, nor do I quite believe it is a fact, but I thought I'd share it.
Start from any page in Wikipedia. Click the (I think) first link in that page, and every subsequent page. You will eventually end up on the philosophy page.
All that I could come up with at this time. I'll see if I can't recall more later