Did you know that the first bull riding events were held in Mexico in the 1500s? They were called jaripeos. Learn more in Bull Riding, one of the titles in the My First Rodeo series.

Sydney is Australia's largest city. It is known for its scenic harbor. Sydney's Harbour Bridge stretches across the harbor, linking the northern and southern parts of the city. Find out more about this fascinating city in Sydney, a title in the World Class Cities series.

Pushing the roundabout makes it spin. Pulling the roundabout makes it stop. Learn more about what is pushed and pulled at the playground in At the Playground. This title is part of the Pushes and Pulls series, which has been developed for children ages 5 to 7.

Visiting a museum is a way to learn about the past. Museums help people understand what life was like many years ago. They also show how the world has changed over time. Find out more in Museums, one of the titles in the Field Trips series.

Did you know that caterpillars turn into butterflies? They make this change inside a hard shell. Find out more in “Butterflies”, a Little Backyard Animals book.

¿Sabías que la Tierra es el tercer planeta desde el Sol? Es el quinto planeta más grande del sistema solar. Descubre más cosas en La Tierra, uno de los títulos de la serie Descubriendo el espacio.

Did you know that planters put seeds in the ground in neat rows? This helps make sure the plants have room to grow. Learn more about these machines in Planters, one of the titles in the Farm Machines series.

Did you know that wolves have their babies in the spring? They take care of the babies in their den. Find out more in “Wolves”, a Little Backyard Animals book.

Singapore is both a city and a country. It is made up of a main island and about 60 smaller islands. Almost 6 million people live there. Find out more about this fascinating city in Singapore, a title in the World Class Cities series.

Did you know that some harvesters can harvest 30 acres of crop in an hour? That is about the size of 23 football fields. Learn more about these machines in Harvesters, one of the titles in the Farm Machines series.