All fifty US states and Washington, D.C., require children from birth through age five to be vaccinated against certain communicable diseases as a condition of attending child care settings such as ...

Haupt is a health and wellness editor at TIME. Haupt is a health and wellness editor at TIME. Asking the older people in your life questions isn’t just about recording a birth location, marriage date, ...

Why do baseball umpires wear black underwear? How long is the longest burp ever recorded? Which two states make it illegal to get married on a dare? If you know the answers to those trivia questions, ...

A nested set is a smart way to implement an ordered tree that allows for fast, non-recursive queries. For example, you can fetch all descendants of a node in a single query, no matter how deep the ...