Let it snow! Professional Artist Elida Field stopped by with a fun art project for the holidays! If you’d like a chance to win the snowy tree painting Elida painted on the show, visit Elida's website.

They may not be quite as famous as his sunflowers or self-portraits, but Vincent van Gogh’s olive-tree paintings still represent an important entry in his sprawling oeuvre of more than 2,000 works.

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 ...