| Countershading | A method of camouflaging in nature, studied by scientists for application in the military |
| Hooper’s paradox, and Missing square puzzle | ○ A mathematical optical illusion; also have a look at videos of ‘infinite chocolate’ |
| Killer ape theory | ○ Did we evolve because of war and aggression? |
| List of numbers | 🐇 A list of numbers that fit certain rules or are of mathematical significance |
| List of topics characterized as pseudoscience | 🐇 Phenomena and beliefs with no scientific backing |
| Optical illusion | Visual illusions |
| System of units of measurement, List of unusual units of measurement, and Medieval weights and measures | 🐇 Dog years, jiffy, Sydney harbour, and banana dose… there’s more than one way to measure something |
| Timeline of the far future | Predictions of what the universe will look like 1,000, 1 million, and billions of years into the future |