My younger daughter, @joannastrogatz, just sent me this link to a cool site where you can see the various harmonics and then listen to them by "plucking" the strings (clicking on them). Great for anyone studying music theory or Fourier analysis. https://t.co/CDP2czOs7vpic.twitter.com/rbW88h4OCR
Here's the formula for the largest number of pieces that can be produced from slicing a doughnut with n cuts. 13 pieces with 3 cuts. pic.twitter.com/XDtAcWx9ci