Two of the biggest mysteries in science are:

• Where is all that dark matter hiding?
• Why is the quantum world so weird?

It’s all to do with dimensions. Our universe consists of, at least, the second, third and fourth dimensions.

What we see and know is the third dimension.

The quantum world exists in the second dimension. Those quantum particles are so small we can’t tell, but they are 2D. And in 2D the rules are different.

Dark matter exists in the fourth dimension. Because we are in a 3D world, we generally can’t see the 4D world.

Occam’s Razor: the simplest answer is more likely to be correct. Mine is as concise as you will ever get 😉