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Picture of the day

Picture of the day

Luis Walter Alvarez (1911–1988) was an American experimental physicist who was awarded the Nobel Prize in Physics in 1968 for his discovery of resonance states in particle physics using the hydrogen bubble chamber. After receiving his PhD from the University of Chicago in 1936, Alvarez went to work for Ernest Lawrence at the Radiation Laboratory at the University of California, Berkeley. He joined MIT Radiation Laboratory in 1940, where he contributed to a number of World War II radar projects and worked as a test pilot, before joining Robert Oppenheimer on the Manhattan Project in 1943. He moved back to Berkeley as a full professor after the war, going on to use his knowledge in work on improving particle accelerators. This 1969 photograph shows Alvarez with a magnetic monopole detector at Berkeley.Photograph credit: Lawrence Berkeley National Laboratory / Department of Energy

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Caterpillar of golden-rod brindle (Lithomoia solidaginis), feeding on Dactylorhiza russowii. Niitvälja Bog, Northwestern Estonia.

Tip of the day

Tip of the day... The Wikipedia Adventure! The Wikipedia Adventure (TWA) is a seven mission interactive tutorial that introduces new editors to basic Wikiquette, policy, and editing skills while earning sixteen editor badges along the way. TWA is a great way to learn the basics fast, without trial and error and is even a great way for experienced or returning editors to freshen up on their skills. Wikipedia is not a game, but a fun way of learning. TWA only takes about an hour. Prior tip – Tips library – Next tip Read more: About The Wikipedia Adventure   Become a Wikipedia tipster To add this auto-updating template to your user page, use {{tip of the day}}