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Readers Respond to the December 2019 Issue

Scientific American April 2020

Letters to the editor from the December 2019 issue of Scientific American

BLACK HOLE BREAKOUT

In “Escape from a Black Hole,” Steven B. Giddings gives us a fascinating update on developments in the black hole information crisis, the seeming paradox of quantum rules and general relativity indicating that black holes destroy information despite quantum mechanics saying that information cannot be destroyed.

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XPOWER X-2380 Mini Air Scrubber Air Purifier, With 3 Stage Filtration System

Getting new devices to market

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