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Energy - where does it come from and how do we spend it?

A hummingbirds rapid wing movement of up to 70 beats per second allows it to hover, fly backwards or even upside down. Its body mass of 2-3 grams verses a human which can be upward of 80 (North America) kilograms or up to 40,000 times heavier than the hummingbird. The average human burns 1,400 to 1,600 calories per day without any physical activity

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Monday - Fun Facts

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