Applying Critical Rationalism to the family
Explains how two people can publicly exchange information to construct a shared secret that an outsider cannot discern from intercepting their communications.
Extremely obscure mathematical concept described in such a fashion that a five year old could follow the explanation. Amazing.
iTunes-free version of the Woodstock Community Church podcast
Definitely coming back to this page a lot :)
Over 1000 comprehensive, clear, bite-sized youtube videos explaining educational concepts - a real delight.