This picture is in time with the average heart rate. What you’re hearing is the sound of your blood pumping, which you aren’t normally aware of. This picture tricks your mind into making yourself aware of your heart rate, so you hear it.
i will never stop being freaked out by this
holy shit tits
WHat tH E FUCk
ARE YOU NOT SUPPOSED TO HEAR YOUR BLOOD PUMP?????? I ALWAYS HEAR MY BLOOD PUMP?????