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At the National Portrait Gallery in London, a new "self-guiding trail" trail introduces visitors to 20 portraits of leading scientific men and women and their work. Welsh artist Sian Edwards has made an installation based on auroral lights after hearing an item on this programme. Psychologists find noisy offices reduce our efficiency by up to 60%. Why the bubbles in Irish stout go down rather than up? Research in the Bahamas on how species recover after natural disasters. Does playing different sorts of music to unborn rats really help some of them learn more quickly than others?

Presenter: David Bellan.