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The opposite sides of a die always add up to 7.

Frogs never close their eyes, even when they are sleeping.

No piece of paper can be folded more than 7 times.

A human eye has 6 muscles that control its movements.

The pupil is actually a hole in the centre of the eye:it allows light to enter the retina.

About 25 persent of human beings sneeze when they look up at a bright sky.

There are no clocks in Las Vagas gambling casinos.

We use 100 percent of our brain, not just 10 percent.

42'

以上
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只希望晚自习时光快点结束～

然后

不谢～