Free Programming Tutorials

Some months ago, I saw an amusing cartoon. Two scientists are in the middle of a huge footprint. One of them says to the other: “I do not see any sign of its presence”, talking obviously of the monster who made this huge footprint. You, as an observer, can see that these two fellows are right in the middle of a huge footprint, but neither of them can notice that — both only notice that the ground level is slightly lower.Often, we are in also in the middle of the footprint and we need totake a n 
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