What's the most "oof" or wtf fact you know about an everyday object?

The chainsaw was first used to saw bone, not trees. This was before anesthesia.

Probably a cheap one and nothing new new but: Meta used to serve you specially predatory adds: about crazy beauty standards when you changed your status in facebook from in a relationship to single. Because they knew you'd be more likely to buy these products when your confidence is at it's lowest.

Nestlé does not only have food products and water in it's portfolio they also owns 20% of L'oréal and their products.

Chewing gum is a petroleum product.

The first microwave ovens created were being used to gently re-warm frozen live hamsters, because when they tried to reheat the hamsters with conventional cooking methods, they heated unevenly and burned at the edges, which isn't good for the hamsters.

Any warning label you have ever seen exists because enough people did the thing being warned against that a lawyer said there needed to be a sign.

Hugo Boss (the clothing line) started out making uniforms for the Nazi Party.

Hiram Maxim (1840 - 1916) invented the modern mousetrap and the first automatic machine gun.

Artificial raspberry flavor is made from beaver anal glands.

"Blue lights on train platforms in Japan have been shown to reduce the chance someone will jump in front of a speeding train. In fact, one study in the Journal of Affective Disorders found blue lighting reduced suicide attempts by 84%. It’s believed blue registers as a calming color, associated with the sky and sea, which may be soothing to people in distress, according to Psychology Today."

I guess people who keep using blue-light filter glasses at end of work will miss this.

During the War on Terror, there was a much-publicized fact that your own household furnishings were much more likely to kill you than terrorist.

Some antique toasters gracefully lifted your toast, perfectly browned, rather than popping them up like it's trying to give you a heart attack.

Those fake astroturf fields and yards people are installing are actually quite toxic. In addition to heating plastic to high temperatures and baking it under powerful UV light each summer, the plastics and rubbers used for them are usually from sources like car tires which are full of PFAS to resist fires, wear, UV, etc. Those leach into surrounding areas whenever it rains.

Not really a secret, but we don't often think about it.

Cash is fucking dirty. Here is the official Fedral Reserve estimated lifespan for each note:

You can assume that something like a $5 bill might change hands on a weekly basis.

So if you a $5 bill that still looks nice, it might be only 2 years old, so it might have seen about 100 owners up until now. It is said that 1 out of 5 people don't wash hands after pooping.

Your $5 bill is probably filled with poop, pee, sweat, food, cum, dirt, etc.

https://sci-hub.st/10.1097/00007611-200295120-00011