When we read old books, we sometimes find that their pages have turned yellow. This has much to do w
[530호]
When we walk down the street, we sometimes come across a group of small flying insects in the air. T
[529호]
When people make kimchi, they will sometimes find black spots on Chinese cabbages and wonder whether
[528호]
Just like humans, sperm whales will have poor digestion if they suffer from stress. Because of poor
[527호]
Every creature dies when it reaches old age. But there is one creature that never dies. This story a
[526호]
Storing fruits in a refrigerator helps us keep them fresh longer. Interestingly, it also helps us en
[525호]
Because of the space between our eyes, we can see the world three-dimensionally. Because we have two
[524호]
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]
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