In the early part of the 20th century, scientists still weren’t sure how old Earth is.
But if you were to go back further in time, a couple million years before anybody figured out how to write, your ancestors would still have two eyes, two ears, a nose, a mouth, a head sitting atop an oblong body with two arms and legs.
My Pugs are part of the family, and any man who wants to get serious about me also needs to be serious about my dogs.
Most online dating sites allow users to set up a profile and browse for free, which makes it easy to see what’s out there; a site specifically geared toward pet owners is a good way to search for potential partners who understand your commitment to your furry companions.
However, the principle of carbon-14 dating applies to other isotopes as well.
Potassium-40 is another radioactive element naturally found in your body and has a half-life of 1.3 billion years.