Grade 5

Troy Polamalu is an unstoppable force--with incredible hair. Considered to be one of the best defensive players in the NFL, Troy uses his incredible speed, agility, and strength to intercept… More →

Most people stop at stations for a brief time when they travel by train or subway. As passengers come and go, the stations are filled with happy greetings and sad good-byes. But are the… More →

Professional wrestling fans first got to know Christian as a vampire. He teamed up with Edge and Gangrel to form The Brood. In time, The Brood split up and Christian and Edge became a tag… More →

Can you guess how to identify a blacktip reef shark? For this reef-dwelling fish, the name reveals all. Dark spots mark the fin tips in sharp contrast with the adjacent white coloring. See… More →

Ostriches are birds that can't fly. They take it in stride, sprinting in short bursts instead. When ostriches can't run from danger, they face it head on. Well, with their heads on the… More →

An oil-filled liver makes the blue shark extra buoyant, allowing this fish to travel incredible distances with ease. One blue shark was tracked as it traveled over 3,740 miles (6,019… More →

A powerful storm has capsized several boats off the coast. Helicopters show up to rescue people who have fallen into the sea. A few Coast Guard rescue swimmers leap from the helicopters into… More →

You may think you're safe from a shark attack if you stay out of the ocean...but you're not! There's a shark that can lurk in rivers as well as the sea; a shark known for beginning its attack More →

It’s the jaws that make great whites great. The lethal chops are studded with razor-sharp teeth that are constantly swapped for sharper replacements. During an attack, the upper jaw acts… More →

Named after General Creighton Abrams, the Abrams tank is the main battle tank of the United States Army. Its powerful main gun, composite armor, and large engine make it one of the most… More →

Predator drones can be used for reconnaissance missions or targeted attacks. Pilots control the drones from remote locations, keeping them safe from enemy fire. These unmanned aerial vehicles More →

Dwayne Johnson is not your average wrestler. Before he was known in the ring as "The Rock," Dwayne played football at the University of Miami, where he was a member of their national… More →