various










The Danish way
Count on your fingers and toes. When you run out, put down a stick and start over.
At 80 you have 4 sticks
85 is four sticks + five.
At 90 you're half way to your fifth stick.
92 is half way to the fifth plus two.
Or as they would have said it "half fifth stick and two"


























Da vinci's self supporting bridge


















Βρές τους αριθμούς που λείπουν σε λιγότερο από 20 δευτερόλεπτα

























There are 16 circles in this picture
















































Αντικουνουπικά φυτά
















Singapore























































































Pacific Ocean

























Civilization













Υπολογιστές τα τέλη τις δεκατίας του 1950















Χρήση μετρικού συστήματος στις διάφορες χώρες













































































































































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