Bbc Inside Science

Britain's oldest tree changes sex - The science behind the headlines - this week it was reported that the Fortingall Yew in Perthshire (known to be a male tree, over 2-5000 years old) had started to produce berries (female) on one of its branches. Dr. Max Coleman from the Royal Botanic Gardens in Edinburgh explains that sexuality in plants is more fluid than in animals.Cryo-volcanoes on Pluto The latest observations from the New Horizons mission to Pluto show possible volcanic-type structures made from ice. The mountains have what appear to be caldera-like depressions in the top. Unlike volcanoes on Earth, that erupt molten rock, the suspected volcanoes on Pluto, would likely erupt an icy slush of substances such as water, nitrogen, ammonia or methane.Sellafield's plutonium The nuclear reprocessing plant in Cumbria has amassed around 140 tonnes of plutonium on site. This is the largest stockpile of civil plutonium in the world. For now it is being stored without a long-term plan, which is costly and insecur