Michel Foucault | Helen Mirren | Jean Michel Jarre | Helen Keller | Michel Gondry | Jean-Michel Basquiat | Helen | Helen of Troy | Helen Hayes | Michel Legrand | Michel de Montaigne | Helen Clark | Michel Houellebecq | Michel Platini | Helen Reddy | Helen Frankenthaler | Michel Plasson | Michel Ney | Helen Hunt | Helen Humes | Mont Saint-Michel | Michel Tournier | Michel Portal | Michel Rocard | Michel Fokine | Michel Deville | Michel Butor | Michel Berger | Jean-Michel Dubernard | Helen Razer |
1980 — Luis Alvarez, Walter Alvarez, Frank Asaro, and Helen Michel propose the Alvarez hypothesis, that a comet or asteroid struck the Earth 66 million years ago causing the Cretaceous–Paleogene extinction event, including the extinction of the non-avian dinosaurs, and enriching the iridium in the K–T boundary.
Alvarez and his father Luis W. Alvarez are most widely known for their discovery (with Frank Asaro and Helen Michel) that a clay layer occurring right at the Cretaceous-Tertiary (K-T) boundary was highly enriched in the element iridium.