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Discover the main systems of our amazing human body with this new series of books!Digestion starts the minute you put food or a drink in your mouth. And by the time the process ends, your body has taken every bit of nutrition possible from your food. Did you know that the average person produces enough saliva in one year to fill a bathtub? Or that the small intestine is the longest part of the digestive system? Learn all this and more in Diges...

Digestion starts the minute you put food or a drink in your mouth. And by the time the process ends, your body has taken every bit of nutrition possible from your food. Did you know that the average person produces enough saliva in one year to fill a bathtub? Or that the small intestine is the longest part of the digestive system? Learn all this and more in Digestive System"--

Envision a brighter future with this STEM-based subset of True Books.Electric cars. Solar-powered planes. Poop-fueled trucks. Each of these technological advances in transportation is bringing us ever closer to a green future, and more are being developed all the time. Considering how many vehicles are on our roads - and in the water and air - sustainable transportation might be the most important innovation we can make to ensure our planet's ...

Envision a brighter future with this STEM-based subset of True Books.Electric cars. Solar-powered planes. Poop-fueled trucks. Each of these technological advances in transportation is bringing us ever closer to a green future, and more are being developed all the time. Considering how many vehicles are on our roads - and in the water and air - sustainable transportation might be the most important innovation we can make to ensure our planet's ...