Fish's memory is only 7 seconds. What's the next sentence?

Fish's memory is only 7 seconds, and it will never be boring.

This sentence comes from the internet. The specific source is unknown. This passage is widely circulated: "As early as a long time ago, someone told me that the memory of a fish is only 7 seconds. After 7 seconds, it won't remember what happened, and everything will be a new beginning. Therefore, in that small fish tank, it will never feel bored. " So many people mistakenly think that the memory of fish is only seven seconds. However, fish only have seven seconds of memory, which is the conclusion drawn by scientists in the last century.

The story goes like this:

As early as the 1960s, someone specially studied the memory ability of goldfish.

1965, researchers at the university of Michigan made an experiment with goldfish. They put the goldfish in a long fish tank, then shoot a light at one end of the fish tank, and after 20 seconds, they release an electric shock at the same end of the light.

Soon, the goldfish formed a memory of electric shock. When they saw the light, they swam to the other end of the fish tank quickly before the electric shock began to be released to avoid the electric shock. The memory of this fish only exists for seven seconds.