(This is Hello World, the short story. For the anthology of the same name, see: https://www.goodreads.com/book/show/4...) Professor Franco Corelli has noticed something unusual. The twitter account @QuestionsLots is harvesting hundreds of millions of tweets each day, but never posting anything. Outwardly, this account only follows one other twitter account—@RealScientists, but in reality it is trawling every post ever made by anyone on this planet. Could it be that @QuestionsLots is not from Earth?