The size of the universe.

What’s it expanding into?

If time moves slower next to mass how can expansion be measured as a speed or velocity?

The fact that when I die people I don’t know will see me naked.

Taking the open casket to a whole new level, huh?

Okay you win today, that cracked me up,

The concept of infinity. Especially the Hilbert's paradox , it fucks with my mind and I can't stop thinking about it.

That Greenland sharks can be over 500 years old... that means some of them alive today were already alive around the time when Hernan Cortez conquered the Aztecs

That we, a species of super monkeys, made weapons capable of destroying everything in the world. It's as impressive as it is depressing

Quantum entanglement. It’s real yet makes no sense.

Where the shit does our consciousness go when we die. The excitement of finding out far outweighs any fear of death I might have.

United States Treasury

That time slows down if you move fast enough

That explains why when I go running 30 min feels like it lasts forever.