Childhood memories, accompanied by childhood, spend boring time in class, compared with friends who jump higher and farther. By adjusting the paper hardness and pressing angle, it can bring unexpected bouncing effect. After folding, everyone can explore for themselves, which is more fun. Let's see how to fold it. Material required: a square colored paper.

1. A square colored paper folded in half on both sides.

Frogs are amphibians, belonging to Chordata, Amphibia, Anura and Ranidae. Its adult has no tail. Its eggs are laid in water, fertilized in vitro, hatched into tadpoles, and breathed through gills. After the mutation, adults mainly breathe through the lungs and skin. Most frogs reproduce by in vitro fertilization, and fertilized eggs hatch outside the mother's body into tadpoles.

Only 10 to 12 frog species in the world have evolved into in vivo fertilization, and some of them will expel fertilized eggs and hatch into tadpoles. But in zoology, the frog refers to the black-spotted lateral fold frog. Frogs have always been regarded as egg-laying animals, but scientists have found that a frog living in the rainforest of Sulawesi Island in Indonesia can give birth to tadpoles. This frog is the only frog that can "drop tadpoles" among more than 6,000 kinds of frogs in the world.