6: The Earth Is Only 6,000 Years Old

Once upon a time, the Bible was considered a scientific work. Really. People just kind of assumed it was accurate, even when it didn't make much sense.

Take the age of the planet, for example.

Back in the 17th century, a religious scholar took a hard look at the Bible and estimated that creation happened around 4004 B.C. (you know, approximately). Add in nearly 2,000 more years to get to the 18th century, when Western, Bible-reading geologists started to realize that the Earth was constantly shifting and changing, and you get about 6,000 years.

Hmm ... those biblical scholars may have been a bit off. Current estimates, based on radioactive dating, place the age of the planet at around, oh, 4.5 BILLION years.

By the 19th century, geologists started putting the pieces together to realize that if geologic change was happening as slowly as they thought it was, and if this Darwin guy was at all right about evolution (which was also a slow process), the Earth had to be WAY older than they had thought. The emergence of radioactive dating in the early 20th century would eventually prove them right.

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For more on carbon dating, check out How Stuff Works.