Snails with right-handed shells cannot mate with those with left-handed ones. But you can predict the presence of oil in a location by looking at their ratios. Subscribe for regular science videos: http://bit.ly/RiSubscRibe Watch the full second lecture of the series: https://www.rigb.org/christmas-lectures/watch/1992/our-world-through-the-looking-glass/narwhals-palindromes-and-chesterfield-station?utm_source=youtube&utm_medium=social&utm_term=description Charles Stirling gave the 1992 Christmas Lectures “Our World Through the Looking Glass”…

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