October 03, 2016 at 02:00AM

Today I Learned: 1) Some games that look at first blush like prisoner dilemma games can be solved by agreeing to alternately cooperate and defect, basically taking turns exploiting each other. If the payoff matrices are right, you can make more money trading off like that than you can by cooperating all the time. 2) The Lotka-Volterra equation, which describes population dynamics for a simple predator-prey model, is mathematically identical to the replicator equation describing evolutionary dynamics of replicators with different frequency-dependent strategies. 3) There are, in addition to vacuuming robots, swiffering robots and mopping robots. I hear they're not very effective (so says Andrey Shur).