This week we’re going to build a rocket which will transport cargo and demonstrate Newton’s third law. This experiment is mess-free, but be sure to be careful where you construct it. Make sure that it’s not in a place where people might walk into it.這一週，我們要來製造火箭。這種火箭可以用來運貨，也可以證明牛頓第三運動定律喔。實驗過程不會一團亂，但還是要慎選製造火箭的地點，不要在別人會經過的地方造火箭喔!
By Catherine Thomas
Balloon rockets氣球火箭

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I didn't notice it was defective when I bought it.

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