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搏扶搖而直上是人類的夢想。今日雖然人類已經能飛了，但是還是不如昆蟲敏捷，也飛不快。要克服的技術問題還很多。當年的火箭之夢已經達成了，現在努力的目標是甚麼？本文探討三種有待努力的飛行方式及最近的發展。水母的噴射推進的研究不但能得到高效率的推進甚至能診斷心臟的功能。
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