Four students in the US have invented a novel way of protecting women from sexual assault on nights out – a nail polish that detects the presence of date-rape drugs.

A group of undergraduates in the Materials Science & Engineering department at North Carolina State University are developing a nail varnish called Undercover Colors that reacts when it comes into contact with drugs such as Rohypnol, GHB and Xanax.

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Older firms are increasingly controlling the largest market share in different sectors of the economy, according to a paper by the Brooking Institution’s Robert E. Litan and Ennsyte Economics’s Ian Hathaway. By 2011, the portion of U.S. businesses aged at least 16 years reached 34%, compared to 23% in 1992. Moreover, those mature companies went from employing only 60% of private-sector workers in 1992 to employing nearly three quarters of the private-sector labor force in 2011.

The report attributes this trend to declining entrepreneurship, among other reasons. The rate of new business creation in the U.S. has been constantly shrinking in the past three decades. “The decline in new firm formation rates had occurred in every U.S. state and nearly every metropolitan area, in each broad industry group, and in all firm size classes,” the authors explain.

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Marc Andreessen, the famously outspoken Facebook board member and founder of Netscape, called Edward Snowden a “textbook traitor” in a CNBC interview that was posted on Thursday.

“Obviously he’s a traitor,” Andreessen said. “If you look up in the encyclopedia, traitor, there’s a picture of Edward Snowden.”

The entrepreneur conceded that his opinion of the NSA leaker was in the “distinct minority” in Silicon Valley. He defended his position by implying that it was a traitorous act to provide national security secrets to the world and saying that American tech companies may lose overseas business simply because they’re from the same nation as an agency that spies on everyone else — from its own citizens to the leaders of allied governments.

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