9. Horses Sweat - Red Dead Redemption 2
This entire list could have been about Red Dead Redemption 2 - and we've actually already made plenty of videos discussing the crazy amount of detail packed into Rockstar's sequel - but it is the gift that keeps on giving.
On top of corpses decomposing and horse balls shrinking because of the weather, it's also been discovered that horses in the game will actually sweat depending on the temperature.
Now, it was mind-blowing when GTA had playable characters who sweated through their clothes, but at least you noticed and appreciated it there. Here, there's a good chance you'll never be that close to a horse to realise - after all, you spend most of the time obscuring the animals you're riding.
It's amazing to highlight how far we've come, but at least you noticed the horse testicles, you know?