Passenger trains have all kinds of carsbaggage cars, lounge cars, dining cars, and sleeper cars. They often need to keep riders comfortable for multiday trips....
Blending in with their surroundings, praying mantises easily grab prey with their spiny front legs. These insects enjoy munching on grasshoppers, spiders, and even small...
Scientists categorize rocks into three different groups depending on how the rock was formed. Humans have used rocks from all groups as tools and in...
Saturn has the largest and most complex ring system of any planet in the solar system. Young learners will read about Saturns discovery, its physical...
Sea turtles have strong flippers to propel them through water. These shelled animals may migrate thousands of miles to lay eggs. Although they are not...
Sea turtles have strong flippers to propel them through water. These shelled animals may migrate thousands of miles to lay eggs. Although they are not...
How can aircraft carriers support heavy jets and helicopters without sinking? Why do cruise ships the size of cities stay afloat, but submarines often disappear...
These important machines make sure people can still use the roads in wintertime. They clear snow so that cars can drive. Discover the different parts...
Movements called vibrations produce sound. Small vibrations make a quiet sound. Big vibrations make a loud sound. This book teaches children what sound is and...
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Passenger trains have all kinds of carsbaggage cars, lounge cars, dining cars, and sleeper cars. They often need to keep riders comfortable for multiday trips....
Blending in with their surroundings, praying mantises easily grab prey with their spiny front legs. These insects enjoy munching on grasshoppers, spiders, and even small...
Scientists categorize rocks into three different groups depending on how the rock was formed. Humans have used rocks from all groups as tools and in...
Saturn has the largest and most complex ring system of any planet in the solar system. Young learners will read about Saturns discovery, its physical...
Sea turtles have strong flippers to propel them through water. These shelled animals may migrate thousands of miles to lay eggs. Although they are not...
Sea turtles have strong flippers to propel them through water. These shelled animals may migrate thousands of miles to lay eggs. Although they are not...
How can aircraft carriers support heavy jets and helicopters without sinking? Why do cruise ships the size of cities stay afloat, but submarines often disappear...
These important machines make sure people can still use the roads in wintertime. They clear snow so that cars can drive. Discover the different parts...
Movements called vibrations produce sound. Small vibrations make a quiet sound. Big vibrations make a loud sound. This book teaches children what sound is and...