Day: February 3, 2020

Imagine that you are the greeter at the door of a party. There are two groups of people who want to get in. We’ll call one of the groups, The Blue Angels. And we’ll call the other group… Group Two. The host would like you to let all of the Blue Angels in; and none of the people in Group Two in. But there’s a problem. You can’t tell the difference between the two groups. And any system you come up with that lets all of the Blue Angels in, will also let in some of the members of…

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