ContentsCalcium signalling: the 'nervous system' of plantsPete BickertonWildlife at risk from drought and human conflictRapha l ColemanWhat is...?DNA replicationAil s KaneVital statisticsHypothesis testing using Student's t-testRobert SpoonerPotato blightLiz SheffieldHow our developmental environment shapes our healthMark HansonUpgradeRevision planningMartin RowlandEcological nicheMartin RowlandDo our immune cells shape asthma severity?Tara SutherlandPracticals in practiceObserving mitosis: the root squash practicalCharles GillInterfaceReleasing the cancer killersRobert NibbsImages of biology'Friendship' for fitnessAnna Birrell