Some of the words you have met in this book may be new to you. Many of them are words you’ll meet again, so they are good words to know. Some are the names of countries that may be hard for you to…
Imagine floating through the air, standing on the ceiling, or leaping upstairs in one big bound! An astronaut traveling through space can do all of these things. But on the earth, you can’t. You…
Blood moves fast. And my heart is what makes it move. Blood leaving my heart right now will travel all the way to my toes and back again in about one minute. Inside my body are thousands of tubes…
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