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Before video games and robotics competitions, toys were much simpler: girls got dolls; boys got model trains and bicycles. Toys that promoted learning and experimentation were rare until one inventor, Alfred Carlton (“A

(PhysOrg.com) -- When trying to focus sound waves into as small an area as possible, scientists run into a fundamental limit called the diffraction limit. That is, when sound waves are focused into a region smaller than one wavelength, the waves begin to bend and spread out.