I remember one teacher I had when I was a child often said “I hope you can learn like sponges, absorbing, then discharging what you absorb, absorbing again and discharging, continuously repeating the process⋯” After I grew up, I realized that, as an organism, a sponge animal does not have nervous, digestive, or circulatory systems. It needs sea water flowing through its body to be able to bring in nutrients and push out waste products. It is passive in its survival. Recently, I encountered something which I had yet to learn, but because I never learned it in the past, it was not easy for...

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