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I get asked a lot of relationship-themed questions given where I work, and one of them is from women with boyfriends who want to know how long to wait for the ring.

We’re also much less likely to get married than previous generations (a shame for party lovers, less of a shame for your bank balance) with 83% of us saying we don’t really feel compelled to get married.

Are there repairs or cracks in the sidewalk that came after the sidewalk was built?

This method works because some unstable (radioactive) isotopes of some elements decay at a known rate into daughter products.

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So carbon 14 is used to date materials that aren’t that old geologically, say in the tens of thousands of years, while potassium-argon dating can be used to determine the ages of much older materials, in the millions and billions year range.

On average, the couples in my study decided to marry 2.8 years after they first showed romantic interest (many couples knew each other before they dated, but that isn’t counted).

To determine the relative age of different rocks, geologists start with the assumption that unless something has happened, in a sequence of sedimentary rock layers, the newer rock layers will be on top of older ones.

This rule is common sense, but it serves as a powerful reference point.

Geologists draw on it and other basic principles ( to determine the relative ages of rocks or features such as faults.

For example, which is older, the bricks in a building or the building itself?

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