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Show i Jet Propulsion Isn't New ; ; Fish Have Long Used It i Jet propulsion isn't as new as i we think. There are about 27fr j species of fish, including cuttlefish,. ; which move through the water j and very quickly by expelling i jets of water from their gill slits, t which are placed in just the right position to make full use of this form of power. Tail and fins are-quite are-quite motionless in this method of submarine travel. ' If jet-propulsion fish finds it is 1 traveling in wrong direction, it I simply puts on emergency brakes by sucking in water through gill slits and expelling it from mouth. ' |