The same is true if you take a block away from one of the pyramid's sides, making the rest unstable.
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Only hard parts, like bones and teeth, can become fossils.
But for some people, the discovery raised a different question.
One place to start is by looking at the age of the materials that make up the Earth itself.
When scientists are able to determine the age of rocks and fossils, they can then tell a more accurate story of the Earths history.
There are two basic types of dating methods geologists rely on, Relative Time Dating and Absolute Time Dating.
In Relative Time dating a specific age in years is not given.
How do scientists know the bones are really 68 million years old?
Today's knowledge of fossil ages comes primarily from radiometric dating, also known as radioactive dating.
Think of the nucleus as a pyramid of building blocks.
If you try to add extra blocks to the sides pyramid, they may stay put for a while, but they'll eventually fall away.
Usually, atoms have an equal number of protons and neutrons.