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A common food emulsifier could solve one of rocketry's oldest fuel problems

In propulsion system design, engineers have long faced a trade-off between solid and liquid rocket fuels. Each has advantages and disadvantages, and in an effort to try to min/max the efficacy of different types of fuel, researchers have long placed an emphasis on a hybrid between solids and liquids—in other words, they've been working with gels. Unfortunately, gels have their own sets of problems to deal with.