The problem is efficiency. Maxwell's equations are completely linear, so nonlinear optics relies entirely on materials with nonlinear response to optical fields. Unfortunately these responses deviate ...

An excellent method of assessing someone's intelligence is through IQ tests. In these assessments, readers are given a problem to solve in a set amount of time. These tasks assess a person's cognitive ...

Optical Illusion: We have a picture given below, which is of a board full of numbers. However, among all the numbers, there is also an alphabet that you have to spot in under 10 seconds!

How is that doubling and not squaring? Is that a domain-specific use of the word doubling that's different from the everyday one? Normally "doubling" would be the function f(x) = 2x. Click to expand..