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]
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]
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