Tim Wright is a geoscience professor at the University of Leeds. The other day he used his Twitter account, @timwright_leeds, to ask his followers what drew them into Earth science. He suggested that everyone replying use the hashtag #WhyEarthSci to make the responses easy to monitor, and as so often happens the whole thing spread through the community. My responselimited to 140 characters like every Twitter postwas, "#WhyEarthSci I couldn't shake a fascination with landscape and planets." Wright has harvested and collated the responses on the Storify site, where the fleeting strings of Twitter conversation can be preserved. See his "WhyEarthSci" story for a quick survey of our core turn-ons.