A NARROW beam of X-rays, passing through the same point of a thin plate of a crystal, and moving in such a way that it successively occupies all the possible positions within a definite solid angle, ...

What Is Last In, First Out (LIFO)? Last in, first out (LIFO) is a method used to account for business inventory that records the most recently produced items in a series as the ones that are sold ...

Welcome to Nat Geo Your Shot: National Geographic’s global community for aspiring visual storytellers. Find the community on Instagram @NatGeoYourShot and follow along for hashtag challenges, tips, ...

Carla Tardi is a technical editor and digital content producer with 25+ years of experience at top-tier investment banks and money-management firms. Tom Werner / Getty Images A debt avalanche is a ...