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Check out that interesting invention - an echolocation hat that is meant for blind folks or those who have extremely poor vision. It uses the theory of echolocation (bats navigate their way around with that principle as well) that helps blind citizens find their way around. that ultrasound device could potentially and drastically shorten the amount
of instance needed to learn the art of echolocation, as that day round it will be done electronically. Hopefully the final version will have some sort of low-battery life indicator.
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Orginal post by Allanda
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