Skydiving can be done solo or in tandem with an instructor. When tandem jumping, a student is attached to an instructor at the shoulders and hips. Learn more about one of the world's most daring sports and the athletes who take part in it with Skydiving, part of the Extreme Adrenaline series.

Did you know that Venus is the hottest of all the planets? The tallest mountain in the solar system is on Mars. Discover these and more intriguing facts in “Planets”.

Did you know that Ramadan has been celebrated for about 1,400 years? The first White House Ramadan celebration was held in 1805. Learn these and other fascinating facts in Ramadan.

Giraffes are the tallest animals on land. They can grow to be 18 feet (5.5 meters) tall and weigh as much as 2,800 pounds (1,270 kilograms). Find out more in Giraffe, one of the titles in the Animals of Africa series.

Rhinos love to roll in the mud. The mud cools the rhinos down when the weather is hot and stops them from being bitten by bugs. Find out more in Rhino, one of the titles in the Animals of Africa series.

Did you know that bats are the only mammals that can fly? Flying foxes are the largest bats on Earth. Learn these and other interesting facts in “All About Flying Foxes”.

What is a baby robin called? How many eggs does a robin lay? Young readers will discover the answers to these questions and more in Robins,an Exploring Life Cycles book.

Did you know that an elephant's trunk has 100,000 different muscles? An elephant's ears are as big as a person. Learn more about these fascinating animals in “Meet the Elephant”.

Did you know that hippos spend more then 16 hours a day in the water? A hippo's grunt can be as loud as a jet engine. Learn more about these fascinating animals in Meet the Hippo.

What is a rabbit kit? How long does it take for rabbits to grow into adults? Young readers will discover the answers to these questions and more in Rabbits, an Exploring Life Cycles book.