大象传媒

The most complete fossil of one of the earliest trees found in the USA is an eight-metre high specimen of the extinct Cladoxylopsida group that formed the first forests of the Devonian period, 380 million years ago. Predictions about the future of the glaciers on Mt Kilimanjaro. Is it possible to bring back plant species extinct on Grand Cayman using seeds from herbarium specimens? The Royal Astronomical Society annual meeting in the UK has been considering subjects including "smartdust" and the role of nanotechnology in space exploration, and William Herschel's observations of Uranus some 200 years ago.