Freakonomics Radio
Your Brain Doesn’t Work the Way You Think
David Eagleman
So it turns out that blind people can make all kinds of sounds, either with their mouth, like clicking... or the tip of their cane, or snapping their fingers, anything like this, and they can get really good at determining what is coming back as echoes and figure out, oh, okay, this is an open space in front of me. Here, there's something in front of me.
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