Rocscience Inc.'s Technical Workshop: Finite Element Modelling of Underground Excavations begins on Aug 26th 2026
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On This Day | February 21

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1971
Tornado outbreak of February 21-22, 1971

On February 21-22, 1971, a devastating tornado outbreak, colloquially known as the Mississippi Delta outbreak, struck portions of the Lower Mississippi and Ohio River valleys in the Southern and Midwestern United States. The outbreak generated strong tornadoes from Texas to Ohio and North Carolina. The two-day severe weather episode produced at least 19 tornadoes, and probably several more, mostly brief events in rural areas; killed 123 people across three states; and wrecked entire communities in the state of Mississippi.

1912
Osborne Reynolds died

Irish-born Osborne Reynolds was an innovator in the understanding of fluid dynamics. Separately, his studies of heat transfer between solids and fluids brought improvements in boiler and condenser design. He most famously studied the conditions in which the flow of fluid in pipes transitioned from laminar flow to turbulent flow.

1852
George Bancroft became American Geographical Society's first president

The American Geographical Society (AGS) is an organization of professional geographers, founded in 1851 in New York City. Most fellows of the society are Americans, but among them have always been a significant number of fellows from around the world. The society encourages activities that expand geographical knowledge, and the interpretation of that knowledge so that it can be useful to geographers and other disciplines, especially in a policymaking environment. It is the oldest nationwide geographical organization in the United States. On February 21, 1852, Bancroft became its first president and served for nearly three years.

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Reinforcement and Stabilization Mechanisms

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