An ocean-going sailboat carries five Chinese and several foreigners from China to Europe  On the way, all but five Chinese suffered from septicemia  Being in the same boat, sleeping in the open air and crossing the sea, why are Chinese people so different from foreigners? It turns out that all five Chinese people have the habit of drinking tea, but foreigners do not
So it is concluded that drinking tea is the reason why the five Chinese do not have septicemia
On two wheat fields where the soil conditions are basically the same, nitrogen and potash fertilizer are applied to one of them, and potash fertilizer is applied only to the other. As a result, the yield of the wheat field with nitrogen and potassium fertilizer was much higher than that of the other. It can be seen that the application of nitrogen fertilizer is the reason for the higher yield of wheat field