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On May 31, 1889, some 2,200 people in Johnstown, Pennsylvania, perished when the South Fork Dam collapsed, sending 20 million tons of water rushing through the town.

On May 31, 1889, some 2,200 people in Johnstown, Pennsylvania, perished when the South Fork Dam collapsed, sending 20 million tons of water rushing through the town.

On May 31, 1889, some 2,200 people in Johnstown, Pennsylvania, perished when the South Fork Dam collapsed, sending 20 million tons of water rushing through the town.

Today is World Heritage day and there are a variety of memorials in Oklahoma - none quite like the tribute to the three storm chasers that were killed by the El Reno tornado.

Real Science explains how deadly super tornadoes are formed and how scientists are working to predict where and when they will hit.

Ann Wroe begins each week with an ending. A death is announced and Wroe, the obituaries editor of The Economist, writes a life. Some names are big — Shirley Tem

The two men were experienced storm chasers

The latest stories from BBC Travel on travel topics from all over the globe: culture, identity, food, history, heritage, archaeology, nature, sustainability, adventure, experiences, destinations and other themes that celebrate the people and places that make the world diverse and amazing.