I want to know the answer to the following question:
On what date was the first self-sustained nuclear chain reaction created artificially?
All the background I'm provided with is that "Working in a lab below the stands of Stagg Field at the University of Chicago, the team created the conditions needed for such a reaction by piling together 400 short tons (360 metric tons) of graphite, 58 short tons (53 metric tons) of uranium oxide, and six short tons (5.5 metric tons) of uranium metal, a majority of which was supplied by Westinghouse Lamp Plant in a makeshift production process.". Is that enough to answer the question?