Full tutorial video link above the title In the video I use : 19 gauge ( wire diameter 0.9mm ) : 18cm( 7 inch) 20 gauge ( wire diameter 0.8mm ) : 2 x 4,5cm( 2 inch), 2 x 2cm( 0,8 inch) 28 gauge ( wire ...

Summary: Humans have vestigial ear muscles that once helped our ancestors focus on sounds. New research shows these muscles still activate when we strain to hear in noisy environments. Scientists used ...

It often uses old structures (or ancient genes) for new jobs. The mammalian ear is a perfect example. Over the eons, the jawbones of our fish ancestors became three separate small bones that ...