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Luis Walter Alvarez, born in San Francisco, invented a radio distance and direction indicator. His research resulted in a major revision of nuclear theories.

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Luis Walter Alvarez 1968 Born: 13 June 1911, San Francisco, CA, USA Died: 1 September 1988, Berkeley, CA, USA Affiliation at the time of the award: University of California, Berkeley, CA, USA Prize motivation: "for his decisive contributions to elementary particle physics, in particular the discovery of a large number of resonance states, made possible through his development of the technique of using hydrogen bubble chamber and data analysis" Field: Particle physics

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1979: From excess traces of iridium in late Cretaceous rocks, American scientist Luis Walter Alvarez theorizes that a large comet or asteroid struck the earth 65 million years ago, raising clouds of dust that reduced the amount od solar radiation penetrating the atmosphere and triggering the mass extinctions of dinosaurs and other Mesozoic life. Luis and Walter Alvarez at the K-T Boundary in Gubbio, Italy, 1981.

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Luis Walter Alvarez - Wikipedia, the free encyclopedia.He is the young fella next to Arthur Compton on the left.

This photo shows from left Helen Michel, Frank Asaro, Walter Alvarez and Luis Alvarez, co-authors of a seminal paper in 1980 on what killed the dinosaurs.

Alvarez Hypothesis: Origin and Evidence Parrish illustration of asteroid blastIn the late 1970's geologist Walter Alvarez, and his father, Nobel-prize winning physicist Luis Alvarez, identified an unusual clay layer at the K/T boundary in Italy

Luis Alvarez: Renaissance man. Polymath. Inspiration. Doer of amazing things. Very smily guy. Seriously, he is so happy! Which he should be. Because his accomplishments are amazing. It’s nice to find heroes in unexpected places … http://en.wikipedia.org/wiki/Luis_Walter_Alvarez

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