The Babylonians used separate combinations of two symbols to represent every single number from 1 to 59. That sounds pretty confusing, doesn’t it? Our decimal system seems simple by comparison, with ...

How do you count rooted planar n n-ary trees with some number of leaves? For n = 2 n = 2 this puzzle leads to the Catalan numbers. These are so fascinating that the combinatorist Richard Stanley wrote ...

Minecraft Snapshot 25W09A introduces new fallen trees at various biomes. Now, the firefly bushes spawn in Mangrove biomes rather than badlands. Finally, the leaf litter blocks have become replaceable ...

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more.

A binary star system, designated D9, has been discovered orbiting the Milky Way's supermassive black hole (SMBH), providing the first compelling evidence that previously enigmatic G objects are ...

Christmas trees are the centerpiece of a holiday celebration. Every year, between 25 and 30 million Christmas trees are sold in the United States, according to the National Christmas Tree Association.

Last summer, a fire tore through the Hawaiian island of Maui, killing more than 100 people and razing thousands of buildings and homes. The disaster was one of the deadliest wildfires in American ...

Three, as Schoolhouse Rock! told children of the 1970s, is a magic number. Three little pigs; three beds, bowls and bears for Goldilocks; three Star Wars trilogies. You need at least three legs for a ...

Abstract: Alphabetic codes and binary search trees are combinatorial structures that abstract search procedures in ordered sets endowed with probability distributions. In this paper, we design new ...