Letters From Our Readers, May 22, 2023

Universal Hydrogen
Credit: Universal Hydrogen
Operative Word: Dreaming The future of fuel cells in aviation is subject to the 1990s aphorism regarding automotive fuel cells: They’re just five years away ( “Dreaming Big,” March 13-26, p. 14 ) . That has been the case for the last 30 years. In the middle of my career, I worked as a research and...

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