Most people imagine ninja as figures clothed in black, scaling a castle wall for a covert mission. But how did ninja actually live their lives? Uncover the secrets and truth of living life as a ninja.

Grab your racket, head to the courts, and ace that serve! It's time to learn about the greatest tennis players of all time. Readers will be presented with exciting stats in a fun top-10 format.

The Los Angeles Dodgers' Clayton Kershaw is one of Major League Baseball's best pitchers. He received the Cy Young Award in 2011 and 2013 and pitched a no-hitter in 2014. Clayton's powerful left arm brought him to the top.

After breaking records and winning awards in college basketball, Brittney Griner was the first pick in the 2013 WNBA draft. She joined the Phoenix Mercury. In her first game, Brittney showed the league her skills by dunking twice. Brittney's height makes her a talented center. She's a force on defense too. Fans love to watch her block shots and grab rebounds. Follow Brittney's story from her early years learning basketball in Houston, Texas, to her...

Exciting photos and engaging text tell readers all about stock cars, from stock car parts and NASCAR races to the history of stock cars.

Although she's just 4 feet, 11 inches tall, Gabby Douglas made a larger-than-life impact on the 2012 Olympic Games in London. Gabby dominated the gymnastics all-around competition with her flawless execution and amazingly high flips, winning gold by a landslide. In early 2012, this pint-sized powerhouse was ready to quit gymnastics for good, but she kept going. Competing at the Olympics at just sixteen years old, she became the best female gymnast...

Tina Charles and Lisa Leslie have dominated women's basketball from the center of the court. Compare their WNBA and Olympic careers, and decide which legendary center is the best.