The Insane 5-Ingredient Rocket Fuel That NASA Almost Built
In 1970, NASA studied a five-ingredient rocket fuel combining hydrogen, fluorine, oxygen, lithium, and beryllium. The theoretical performance was dazzling, but the practical risks—toxic leaks, explosions, and crew safety—were catastrophic. This story reveals a timeless engineering truth: unconstrained optimization leads to unusable complexity. True innovation embraces constraints, not more moving parts.