If your floor really needs more than that, consider a low-cost alternative to refinishing: Apply a fresh topcoat of nonyellowing polyurethane, found in the flooring section of a home improvement store. Be sure to very lightly sand the floors with a pole sander and fine-grit sandpaper.
There are 440 different species of sharks in the world today classified into eight different orders described below with some examples of known sharks species for each group.
Do we know exactly how many people there are in the world today? No. There are so many people on this planet that counting them up, exactly, is impossible. However, experts believe there are more than 7 billion people in the world today. This is a fairly reliable estimate. World population in 2014 was over 2 times greater than it was in 1965, 4 times greater than 1910, and 10 times greater than 1730.