Title: An investigation on using Human urine as a Fertilizer
Hypothesis : Human urine can help plants grow better and act as a
fertilizer.
Title: An investigation on whether people can accurately determine if a
smile is genuine or fake.
Hypothesis : People can determine if a smile is genuine.
Title: An investigation on water plants determining the water quality.
Hypothesis : If the quality of water is poor, the number of duckweeds in it
will decrease.
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