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Our food combines with saliva when we eat. This lets the food disperse the flavors across the entire tongue and its taste buds. This experiment will single out the specific areas for each type of taste bud and its flavor.
What you will need:
Cotton swabs
Tonic water (bitter)
Lemon juice (sour)
Salt water
Sugar water

With the cotton swab, apply a small amount of one of the solutions to the area of the tongue that contains its taste buds. Try this with all the different solutions and their correlating areas of the tongue. Use the solutions in other areas of the tongue that do not contain that taste bud as well.