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 ...

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. ...

Encrypted VoIP not as secure as it sounds

(PhysOrg.com) -- Linguistics researchers working with computer scientists at the University of North Carolina have shown that voice conversations over the Internet, even if they are encrypted, are not as secure as generally ...

Report: NSA spying broke privacy rules many times (Update)

The National Security Agency has broken privacy rules or overstepped its legal authority thousands of times each year since Congress granted the U.S. intelligence agency broad new powers in 2008. In one case, telephone calls ...

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