a real thing they presented at TechCrunch in 2015 now first question you might ask is can we have universal data compression so their fundamental question you'll see in this lecture a lot of questions we ask them to be very fundamental where we can give actually very very strong theoretical answers sometimes negative answers so can we come up with universal data impressive would that mean that would be can we come up with something that no matter what let's say filing you give it it can make it smaller and later decompress it