Your birthday may or may not actually be the same as when you were born. You just have to assume your parents didn't lie to you.
There are technically 365.25 days in a year, but the .25 are collected together and form Feb 29. How? I don't know!
Adrenaline doesn't actually push us to do superhuman things, just things we were too lazy to do or never had any reason to.
In division, 3 is a weird but consistent number. 7, however…
Good morning/day/evening etc are basically declarations that we accept as greetings. Worse is when you just say Morning/Evening. That is information taken as greeting.
The most commonly said lie is “I'm fine” followed by “I don't know”. The most commonly implied is “I’ve read the terms and conditions".
The reason February only had 28 days(instead of 30 like a normal month) was mainly because of Roman superstitions.
We do use more than 10% of our brain's power, BUT we don't use up to 10% of our brain's full capacity i.e all the things you'll ever know only occupy a small fraction of your brain's storage capacity.
Water increases in volume when frozen. By about 9%.
The probability of anything happening without taking external factors into consideration is either 0, 0.5 or 1. It only changes when other factors are included. e.g: Probability of you being struck by lightning in a rainstorm is 0.5 or 50%. It only reduces or increases when population, number of lightning strikes in that area and other factors are taken into account.
You actually hum with your nose, and as such you can't hum while holding your nose.
The Humpty Dumpty rhyme never says he's an egg!
Hippopotamus' milk is pink.
The most eaten fruit is… tomatoes.
Most people are right handed.
The plastic tip at the end of a shoe lace is called an ‘aglet’.
The Andromeda Galaxy is the closest spiral Galaxy, but not the closest galaxy to the Milky way by a long shot.
Sources:
https://www.britannica.com/story/why-are-there-only-28-days-in-february
https://en.m.wikibooks.org/wiki/Structural_Biochemistry/Unique_Properties/Expansion_upon_Freezing