You might have wondered why a cheesesteak bag or a pizza box becomes slightly see-through when touched by its greasy contents. To understand why, we need to understand how light interacts with matter.

The Royal Society is a self-governing Fellowship of many of the world's most distinguished scientists drawn from all areas of science, engineering and medicine, and is the oldest scientific academy in ...

A CURIOUS thing in connection with colour having come under my notice, and never having before seen it remarked in any scientific journal, I take the liberty of bringing it before your notice; of it ...