Nowadays, it is easy for us to enjoy seedless grapes. How do we grow them? Seedless grapes are not g
[523호]
Fingernails are necessary. They help us pick up things easily and hold on to things tightly. There a
[522호]
Passing gas is a necessary and normal part of digesting food. Absolutely everybody in the whole worl
[456호]
Many people carelessly recycle plastic products, so they enter the oceans through drains. These plas
[521호]
Because sunglasses protect our eyes from the sun, they are necessary in the summer. There are many s
[520호]
When we visit BBQ restaurants, we are less likely to find ceiling-mounted air conditioners than stan
[519호]
Because eggs are cells, they can breathe. There are about 7,000 tiny holes on an eggshell. This is w
[518호]
Although flamingos are well-known for their pink fur, they are born with grey fur. Flamingos usually
[517호]
When we travel by car, we see many warning signs. Interestingly, all of them are red. This is becaus
[516호]
Since we need cars and factories, we cannot help but produce exhaust gas. To solve this problem, res
[515호]
[이전10개] 31 32 33 34 35 36 37 38 39 40 [다음10개]
