How do crabs do magic?

Two crabs and two earthworms met on the road. After discussion, they decided to go into the city for a walk.

Ah! The city is really fun, you can get whatever you want. They are just dazzled by the sight.

When they came to the cinema, they wanted to watch another movie, but when they touched their pockets, there was not a penny left.

What to do? One of the earthworms suggested: "How about we try to make some money?"

Make money? Of course that’s good! But how to make money? The same earthworm confidently said: "Let's go to the square to perform magic. There are many audiences there and we can make money."

So they came to the square and put up a sign that read: Please watch the thrilling Magic show - cutting earthworms. Immediately, many spectators gathered around to take a look, and saw one of the earthworms lying in the center of the field, and the other two crabs raised their scissor-like front legs and cut it into two pieces with a click.

The audience exclaimed. Some saw the murder and wanted to rush up and catch the crab that committed the crime.

The second earthworm quickly stopped him and said, "Don't worry, please take a look!" It pointed at the lying earthworm and said.

The audience was stunned when they saw it: the two severed earthworms turned into two complete earthworms with a head and a tail.

“What’s going on?” the audience asked strangely, “How did it turn into two earthworms?”

“How is it? Our thrilling magic lives up to its name. Right? Thank you for your support, please give me a reward if you have money, and give me a round of applause if you don’t have money.”

A round of applause broke out, and the audience was amazed, applauding hard, and dropped the ball at the same time. A lot of money.

Crab No. 2 is also eager to try. It calls Earthworm No. 2 to lie down on the field and raises the crab high to attack.

"Slow down!" One of the crabs stopped it and said, "Do you know the key to this?"

"Yes! I know!" The second crab responded casually and said While cutting off the rear part of the second earthworm.

One of the crabs screamed: "No!"

The other crab asked quickly: "What's wrong?" One of the crabs looked helpless.

The audience watched with great interest the earthworm that was broken into two parts on the ground to see how the broken earthworm regenerated.

After a while, everyone saw that the earthworm with only a tail and no head grew not a head from the severed part, but a tail, turning into a headless earthworm with two tails.

The second crab was stunned and asked the first crab anxiously: "The earthworm you chopped can grow a head, why can't mine?"

The first crab said: "If you cut off the first five to eight segments of an earthworm, you can quickly regenerate it into a complete earthworm. If you cut it off after fifteen segments, the second half will not be able to grow a head, but only a tail."