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.
In fact, every shark attack is unusual, even at a time when the number of incidents seems to be rising, if only, according to some experts, because the number of people in the water is rising. In 1999, 58 people were attacked worldwide by sharks, just up from a 10-year average of 54.