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A YouTuber spent 4 years helping strangers find lost relatives; then a DNA test gave him a 22.7% match with a 66-year-old Texas woman who turned out to be his long-lost sister Scientists discover how snails turn mucus into five different materials using calcium, collagen VI and changing protein levels | Scientists use robots more than two kilometres beneath the Pacific to discover huge lava fields around an active underwater volcano | Melinda French Gates’ father worked on NASA’s Apollo missions; the women engineers she met at his company picnics shaped her thinking | World News ‘The flood is on its way’: How 400 Nepal students escaped in time