If by now you're convinced that 2 + 2 does not equal 4
(because two 2's can't be in the same row or column of course
),
then you can broaden your numbers horizon with "the Grapes of Math"
(How Life Reflects Numbers and Numbers Reflect Life),
by Alex Bellos:
http://www.amazon.com/The-Grapes-Math-R ... 1451640099In the UK the title starts with "Through the Looking-Glass":
http://www.amazon.co.uk/Alex-Through-Lo ... 1408817772The link to the Dutch version I posted some time ago:
http://www.bol.com/nl/p/genieten-van-ge ... 0021947484 ("Genieten van getallen").
Patrick