The Question You Can Always Ask: “How Do You Know That?”

A nine-year old girl asked a NASA tour guide about the age of moon rocks. Her family taught her that the universe is only 6,000 years old, which scientists believe is nowhere close to the truth. Who’s right here, and why? And was this little girl right to question the scientists?

Scientist PZ Meyers of the University of Minnesota provides an excellent kid-friendly explanation not only of the radiometric dating process that’s used to determine the age of very old things like moon rocks, but also of how and when it’s appropriate to question what we know about the natural world. (In short: it’s important for a scientist to be critical-minded, but it’s important to ask questions and pay attention to answers that provide more information instead of reinforcing ideas that we already have.)

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