A turns out not "family tree", and a complex network. After all, each person is not a parent, but two, so each person has to hold up two lines: one - to his father, one - to his mother. This network can be converted vitapulse    into a tree, removing some of these lines. For example, you can leave only those lines that connect each person with his or her mother (see. Figure). Then these "mother" line different people inhabiting the earth today, will meet each other in the women who are their ancestors, and for various modern people we choose, these meetings will be a different number of generations ago. In order to ..

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