Interesting (2 m) links in an unsorted list

"If we knew what we were doing, it wouldn't be called research" A. Einstein


copy paste the following in Matlab: x=[-2:.001:2],y=(sqrt(cos(x)).*cos(200*x)+sqrt(abs(x))-0.7).*(4-x.*x).^0.01,plot(x,y);

Threshold phenomena example