Gear-obsessed editors choose every product we review. We may earn commission if you buy from a link. Why Trust Us? Two thousand years after the Indian mathematician and poet Acharya Pingala first ...

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 ...

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