system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5: How are humans 70% water?

Like I've heard it before, but can someone explain how that can be if we're mainly blood, skin, organs and bones? As in, not watery things?
gpt
The same way a water balloon is mostly water, despite feeling substantial. Most of our body's cells are like water balloons; they have a membrane along the outside and water on the inside. Now of course, that water inside the cell has proteins, mitochondria, and other life substances. However, all of the in between spaces are water.

Blood is an even better example. ~90% of your blood is water believe it or not.