Mitochondria is the powerhouse of the cell.

Mitochondria is the powerhouse of the cell pic.twitter.com/1bGJ5VAB9r

— Dank Memes (@theMemesBot) November 16, 2019

Yep, this useless fact has stayed with us since elementary school. On the bright side, it’s been the source of many a fun meme.

Vending machines are more deadly than sharks.

Think about this next time you go to retrieve a Snickers bar: Between 2002 and 2015, the National Electronic Surveillance System reported that vending machines caused four deaths per year in the U.S. Mostly due to people tipping the machines onto themselves.

Compare that to the shark-related deaths averaging out to just 0.6 deaths per year. Not sure how only about half of a person is considered dead, but math was never my strength.

This statistic might need to be taken with a grain of sea salt, however, given that those in landlocked states have next-to-zero chances of experiencing a shark attack. But there you have it, a useless fact to use when you’re at the beach.

Snails have teeth.

“They’re not big enough teeth to hurt humans. That’s what makes it a useless fact to know. & it won’t leave my head because it’s juuuuuust disturbing enough to make me rethink my entire opinion on snails.” – ghosts-go-boo

But cows do not.

At least, no upper front teeth. Makes chewing—and dentist visits—easier I suppose.

The Sun is about 400 times bigger than the Moon but also about 400 times farther away from Earth. So they look to be about the same size.

This explains how the sun can be completely blocked in an eclipse.

Pigeons and doves are in the same bird family.

Columbidae is a subspecies of birds that are stout bodied, with short necks, and primarily feed on seeds, fruits and plants. Though one lives on as a symbol of peace and love, and the other is often considered a flying rat, the names are practically interchangeable.

However, thinking about Stevie Nicks singing, “just like a white-winged pigeon” doesn’t have quite the same ring to it.

The length of a jiffy…

According to ScienceFocus.com, physicists use a “jiffy” to define how long light takes to travel one femtometer (which is a tiny fraction of a millimeter). In layman’s terms, one jiffy equals one-fiftieth of a second.

So next time you say, “be back in a jiffy,” know that you better return really, really, really fast.

Most corn is inedible for humans.

“1% of the corn grown in the USA is sweet corn (the corn you eat as corn). The other 99% is field corn (or dent corn), which is fairly inedible raw and needs to be processed before human consumption. This field corn is also what they use for non-edible corn products, like ethanol, paint, cosmetics, etc. Yes, most corn goes to livestock feed. Ethanol and High Fructose Corn Syrup are up there as well. Yes, if you're driving on a highway and are passing fields of corn, you very likely cannot eat it.” – Kat_lbltko1pl

Infants have flexible bones.

Ever wonder why toddlers seem so much more flexible? This is because a baby’s skeleton is very different from an adult's. Babies are born with about 300 bones (94 more than adults) that are joined together with pliable cartilage to make that whole birth thing possible. As they get older, the bones will fuse together. And suddenly that toe touch is nothing but a distant dream of the past.

Numbers from 1-999 don't have the letter "a" in word form.

Some vowels just don’t get the respect they deserve.

John Wilkes Booth and Lee Harvey Oswald are both known by three names. And each full name is composed of 15 letters.

Actually, this is not entirely correct. Oswald’s full name was not used until after Kennedy’s assassination, due to his habit of adopting false names.

Cockroaches molt.

Unlike a reptile shedding it’s skin, cockroaches molt out of their entire exoskeleton. Out crawls a soft, fleshy, ghostly-white creature that will turn brown over a few hours. You’re welcome for the nightmare fuel.

There you have it. Gems of wisdom no one asked for. They say knowledge is power. But in this case, I’d say knowledge is unnecessary. But still fun!

This article originally appeared three years ago.