Whichipedia
Guess which Wikipedia entry is longer.
British coins make a shield when put together
Uncyclopedia
The content-free encyclopedia that anyone can edit.
The James Webb Space Telescope explained in 9 minutes
Echinopsis Cacti in Bloom
The Preciousness of Time: A Stephen Hawking Tribute
Some needle-felted wool animations by Andrea Love
Powers of Ten™ (1977)
An oldie but a goodie.