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** Frequent cannabis use during adolescence and early adulthood can raise the risk of psychotic symptoms later in life, particularly if individuals are genetically vulnerable to the illness, said Dutch researchers in the British Medical Journal. They found few signs that those more vulnerable to psychosis were more likely to use the drug.
** The tails of male swallows, whose length is thought to attract females because males must be in good health to grow them, have become much longer over the last 20 years, says a study in the Journal of ...