I mis-stated Friday's math puzzle. Find 2 consecutive numbers such that, when you add the digits of the first number, the sum is divisible by 7 and the sum of the digits of the second number is also divisible by 7. Sorry about that!
New article about Erno Rubik.
http://www.puzzlesolver.com/puzzle.php?id=29;page=15 Very old article about Rubik.