We all know we live in three-dimensional space. But what does it mean when people talk about four dimensions? Is it just a bigger kind of space? Is it "space-time," the popular idea which emerged from ...

Knots are not just for shoelaces and sailing lines. In the last decade, physicists have shown that swirling liquids can spontaneously tie themselves into intricate knots, and they are finally starting ...

Ever wondered what four dimensions really mean? Discover why knots can’t exist in 4D space — and how mathematicians use cubes and clever analogies to understand higher dimensions.

Add Yahoo as a preferred source to see more of our stories on Google. We all know we live in three-dimensional space. But what does it mean when people talk about four dimensions? Is it just a bigger ...