The popular subreddit called Explain Like I Am Five is now internet slang (ELI5). Why is it so popular? Because it breaks down complex questions into simple answers. Forget five-year-olds — these days, even adults need to make sense of the technobabble around us. A new tool from Google’s Jigsaw incubator and Washington Post aims to solve that problem with a simple but ground-breaking tool: Sideways Dictionary.