To a nonmathematician, having the letter “i” represent a number that does not quite exist and is “imaginary” can be hard to wrap your head around. If you open your mind to this way of thinking, however, a whole new world becomes possible.

I’m a mathematician who studies analysis^[1]: an area of math that deals with complex...

Curious Kids^[1] is a series for children of all ages. If you have a question you’d like an expert to answer, send it to This email address is being protected from spambots. You need JavaScript enabled to view it.^[2]. Is ranch dressing a liquid or a solid? – Gabriel, age 8, DeLand, Florida Imagine you’re eating dinner. You try to pour some ranch dressing^[3] onto your plate to dip your

Each cell in your body relies on precise communication with other cells to function properly. At the center of this process are the molecular switches that turn communication signals in the body on and off. These molecules are key players in health and disease. One such molecular switch is G protein-coupled receptor kinases^[1], or GRKs for...