The most stupendously mind blowing facts to keep you up at night

You don't have a skeleton inside of you. You're a brain. You are inside of a skeleton. You're piloting a bone mech that's using meat armor.

The Many-Worlds Interpretation Theory states every time you make a choice, a parallel universe is created where a different version of you explores the alternative path. and all these versions collectively form your multidimensional self.

You never truly touch anything. Atoms repel each other, so every touch is the sensation of electromagnetic forces at play, not actual contact. 

Your body hosts roughly equal human and bacterial cells.

Modern estimates place the human cell count at ~30 trillion and bacterial cells at ~38 trillion, a near 1:1 ratio.

Entropy of an isolated system never decreases.

The second law of thermodynamics states that entropy, a measure of disorder, can only increase or remain constant in a closed system.

Atoms are overwhelmingly empty space.

A typical atomic nucleus (~10⁻¹⁵ m radius) is about 100,000 times smaller than its electron cloud (~10⁻¹⁰ m radius), making an atom >99.999 % empty space by volume.

The denser the mass you’re next to, the greater the curvature of spacetime and the more pronounced the time‑slowing effect.