Published November 14, 2014 at 500 × 126 in Ancient shellfish remains rewrite 10,000-year history of El Niño cycles A magnified cross-section of a shell. The lines in the outer layer come from growth during low tides, and help to put a time on the temperature measurements. Image credit: M. Carre / Univ. of Montpellier (Visited 9 times, 1 visits today)