The Weather of the Century App was presented at MongoDB World 2014 by MongoDB Engineers André Spiegel and Jesse Davis. The app takes as input any location on Earth and a time since 1901, displays embedded Google Earth with temperature measurements for that hour, and updates the display every few seconds until the "stop" button is clicked. The data used in the app comes from NOAA's Integrated Surface Data set, which contains surface weather observations around the world, stretching back to 1901. The dataset was initially sparse before the 1930s but saw a significant increase in the 1950s and jumped radically in 1970. To handle this massive amount of data, MongoDB was used with an ETL system written by André Spiegel to import the data into the database. The app's schema is designed to handle the variability in record content, using MongoDB's strengths such as handling large amounts of optional sections and retrieving entire records with simple queries.