Our Changing World for Thursday 2 April 2015

9:46 PM.The trial on a healthy volunteer continues with tests to alter blood pressure including an ice challenge, mental arithmetic and a hand grip task Audio

9:34 PM.A healthy volunteer is tested with drugs to study the two systems that regulate blood flow to the brain, with implications for treatment of stroke Read more Audio

9:20 PM.If you want to attract native birds to your garden, putting out bread may not be the right thing to do. Read more Audio

9:06 PM.Geologists samples fossils of microscopic plants and animals to study ancient climate change and extinctions. Read more Audio