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.
Aggressive overfishing threatens to push some shark species to extinction, and a new study puts annual shark deaths at 100 million. Our analysis shows that about one in 15 sharks gets killed by fisheries every year, study leader Boris Worm, a professor of biology at Canada's Dalhousie University, said in a statement. With an increasing demand for their fins, sharks are more vulnerable today than ever before.. Based on available data for shark deaths and estimates of unreported illegal catches, the researchers estimated that 100 million sharks were killed in 2000 and 97 million in 2010.