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Will new research into the plaques of beta amyloid protein in the brain that cause Alzheimer's disease lead to a treatment or vaccine? Listeners' nominations for the greatest inventions of 20th century to be included in the Science Museum's new gallery in London. How the world's coral reefs could be wiped out in a few decades by global warming. Marine archaeologists at work on a 17th-century shipwreck on the seabed at ancient harbour of Galle in Sri Lanka.