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The most important stimulant in tea leaves is?

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More Everyday Science Questions

How many major gases have been used in refrigerators since its invention? 'W'h'a't' 'd'o'e's' 'H'M'P'V' 's't'a'n'd' 'f'o'r'?' At what angle above the horizon must the sun be to create a rainbow? Which has the lowest pH? Apiculture refers to___________?