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    Why do scientists use sound waves in water?

    Wales use sound waves to *see* obstacles, from rock formations to prey. An obstacle will reflect the sound wave back, which tells them something's ahead. You can find reports on the connection between disoriented whales and underwater *sound pollution* due to vessels. Scientists can use...
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    What is antigravity? How would it possibly work?

    The gravitational force is a vector with a specific direction. By opposite do you mean a vector of opposite direction? That would simply be called gravity in a different direction. Anti-gravity could hardly be an opposite of gravity. It would have as an effect the obsolescence of gravity, but...