From Estonia to Antarctica, this once-pagan symbol has taken on many strange forms. In December 1848, an illustration showed Queen Victoria, Prince Albert, and their children admiring a Christmas tree ...

Many of the best artificial Christmas trees are on sale for Cyber Week, including our best overall pick, the National Tree Company Douglas Fir. For more deals, check out our roundup of the best Cyber ...

Pupils are swapping desks for dens and timetables for tree trunks as a Devon school brings outdoor learning to the heart of its curriculum. Thomas Hall School has confirmed that all students will now ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Trees depicted in ...

What makes a tree a tree? Or rather, why can we recognize trees in even quite abstract depictions when they are so varied in nature? Researchers have found a clue in the branches, and used math to ...

A new study shows how students can better understand and interpret conditional probabilities. A new LMU study shows how students can better understand and interpret conditional probabilities. How ...

A new LMU study shows how students can better understand and interpret conditional probabilities. How trustworthy is a positive HIV test result? How probable is an actual infection when the test is ...

All species on Earth, both living and extinct, are related. We know this because of a biological tool called the tree of life. This "tree" takes the form of a diagram that maps the relationships ...

Sometimes your gut feelings lead you astray—particularly in mathematics, in which one constantly comes across results that seem impossible. For example, infinity does not always equal infinity, and ...