Arriving home after a long day, you settle in for a quiet evening alone.

But instead of the sound of silence, you hear a constant ringing—

even though there’s nothing making any noise.

What you’re e

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In a pitch-black cave, bats can’t see much.

But even with their eyes shut,

they can navigate rocky topography at incredible speeds.

This is because a bat’s flight isn’t just guided by its eyes,

but r

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[Music]

how do you use your voice

to your advantage speaking

is the form we most commonly use to

communicate with one another

and the human voice is a simple machine

which can be broken down into four

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