Since we need cars and factories, we cannot help but produce exhaust gas. To solve this problem, res
[515호]
When we produce tin cans, we use a protective layer of tin. The inner parts of the cans become rusty
[514호]
A red snow crab’s shell contains a special substance called chitin. When this substance goes throu
[513호]
Lightning is a dangerous natural phenomenon. On average, it carries 100 million volts of electricity
[512호]
Many animals use various means to protect themselves. Poison frogs have a special venom in their bod
[511호]
Surprisingly, camels’ ancestors lived in North America. However, they moved to the northern parts
[510호]
We involuntarily yawn when we feel sleepy. Yawning increases our concentration by giving our brains
[509호]
Interestingly, many Portuguese conservationists have been preserving artworks with saliva. They say
[508호]
Interestingly, a panda’s black and white fur has a lot to do with its life pattern. Black and whit
[507호]
Although avocadoes are rich in vitamin C and D, they are detrimental to the environment. We need 320
[506호]
[이전10개] 31 32 33 34 35 36 37 38 39 40 [다음10개]
