Leonardo da Vinci's tree rule may be explained by wind

(PhysOrg.com) -- More than 500 years ago, Leonardo da Vinci observed a particular relationship between the size of a tree’s trunk and the size of its branches. Specifically, the combined cross-sectional areas of a tree’s ...

The mathematics of golf

(Phys.org)—The official Rules of Golf, which are continually being revised and updated as new equipment emerges, have close ties to mathematics. In many cases, math is used to place limitations on golf equipment, such as ...

Uncovering Da Vinci's rule of the trees

As trees shed their foliage this fall, they reveal a mysterious, nearly universal growth pattern first observed by Leonardo da Vinci 500 years ago: a simple yet startling relationship that always holds between the size of ...

Judge says NSA program is likely unconstitutional

In the first ruling of its kind, a federal judge declared Monday that the National Security Agency's bulk collection of Americans' telephone records is likely to violate the U.S. Constitution's ban on unreasonable search. ...

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