133 Essays on Infinite Lifespans   Marvin L. Minsky we will build a state of perfect health. Some people expressed a sounder concern – that the old ones must die because young ones are needed to weed out their worn-out ideas. However, if it is true, as I fear, that we are approaching our intellectual limits, then that response is not a good answer. We would still be cut off from the larger ideas in those oceans of wisdom beyond our grasp. [2] References 1) Landauer, TK; “How Much Do People Remember? Some Estimates of the Quantity of Learned Information in Long- term Memory”, in Cognitive Science (1986) pg.10, 477–493 2) This article first appeared in Scientific American, October 1994 with some minor revisions.