In physics classes it is taught to include units when evaluating formulas with values and to always check that the units work out right in equations. That way we easily detect if we forgot to square a ...

We tend not to dwell on the fact that we exist in three dimensions. Forwards-back, left-right, up-down; these are the axes on which we navigate the world. When we try to imagine something else, it ...

What if the Universe – and fundamentally, space itself – were like a pile of laundry? Have one. See this laundry pile? Looks just like our universe. No? Here, have another. See it now? It’s got three ...