According to a comparative survey, the National Venture Capital Association found that the "liquidity drought for venture-backed startups is so bleak" it's being called a crisis, reports Tech Crunch. There were no venture-backed IPOs in the second quarter of 2008, and the last time this happened in a quarter was in 1978. Last quarter there were only five IPOs worth $283 million compared to 43 of them during the first half of 2007 for $6.3 billion.

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Researchers suggest that genetic variations could influence the side effects people experience when using synthetic cannabinoids, the International Business Times reports.

An analysis has examined the makeup of researchers on Twitter and what they share, Nature News reports.

At Stat News, Jim Kozubek argues that the Broad Institute is pushing the boundary of what a nonprofit is.

In PNAS this week: gut microbes may affect honeybee weight, phenotype and gene expression changes in DiGeorge syndrome, and more.