Nothing happens if you see the same thing twice. People who are said to have already experienced something before it actually happened are said to be having deja vu. This means a person is doing something or seen something they feel they've already done before.
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because the same number can go in to it twice see 7+7=14
The Letter "e"
Ok i can see where you would have trouble with this. When i first started Algebra, i wasn't quite sure how this worked. Here are some examples: 2-+2=0 the subtraction sign cancels the addition out. (2-2 is the same thing) 2- -2= 4 the two subtraction signs make an addition sign. (2+2 is the same thing) I hope i could help you.
I'd say it's worthless, but what the heck, put it on eBay and see if someone will pay a couple hundred bucks.
Yes. Just add the same number to each square and see what happens. Also, there are magic squares of different sizes.