You might think that answering the question about how old the Earth is should be fairly straightforward. But that is not the case. Over time the values arrived at have changed quite dramatically and resulted in heated controversies involving the fields of physics, geology, biology, paleontology, solar astrophysics, cosmology, and theology. Depending on who you talked to and when you talked to them, you would have got wildly different answers. Over a period of over two thousand years, the Earth started out being considered really old, even possibly infinitely old, then became really young (thousands of years), then became sort of old again (hundred of millions of years), then younger again (tens of millions of years) until now it is considered really old (billions of years). (Excerpt from Science Café website)
The books below provide a look at the topic of Dr. Singham's talk for those interested in exploring further. Click the titles to link to the library's catalog to place a hold or to get additional information.
Cleveland Public Library - Main Library - 325 Superior Ave - Cleveland, Ohio 44114 - 216-623-2800