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.
Every single year, it's estimated around 100 million sharks -- between six to eight percent of the world's total shark population -- are killed by humans as a consequence of commercial fishing. Comparatively, sharks only killed three people across the globe in 2014.