"In 2013, we ended up building a system called NEAL. NEAL stands for Never Ending Image Learner. So it is a program that runs 24 hours a day, seven days a week to download images from the web and learn common sense knowledge about the world. And this got really, really famous even in it appeared in all the media articles because this was the first program that was trying to learn common sense on its own from the web essentially. And that was a very eyeopening experience for me in 2013 because what happened was while I was trying to like, all these images were being downloaded. It learned common sense knowledge like for example, cars have wheels, buses have windows, planes have wings and so on and so forth. But it could not learn common sense that you and I learn a lot in our life. Like for example, if I put this mic down, it will fall. This kind of common sense knowledge is very, very hard to learn."