On July 21, 1969, Neil Armstrong spoke the instantly famous words “that’s one small step for man, one giant leap for mankind” as he stepped off the ladder of the Apollo Lunar Module and became the first human being to walk on the surface of the Moon.

In addition to its many other, and more significant, scientific milestones, the Moon landing provided an excellent demonstration of three related, and often misunderstood, scientific concepts: mass, weight, and gravity.

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