This says it was an idea to pull rocket fuel to the right end of the tank without gravity https://www.nasa.gov/feature/glenn/2021/history/novel-rocket-fuel-spa

This says it was an idea to pull rocket fuel to the right end of the tank without gravity https://www.nasa.gov/feature/glenn/2021/history/novel-rocket-fuel-spawned-ferrofluid-industry https://www.nasa.gov/feature/glenn/2021/history/novel-rocket...