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.
USA and Australia are the most sharks infested countries in the world. From year 1580, a total of 572 shark attacks killed 153 people in Australia. In the United States, 1100 attacks have already caused 35 deaths. Florida and California have been suffering more than any other US state.