As an Evangelical and a scientist, Katharine Hayhoe is already a member of a rare breed. As a climate change researcher who is also married to an evangelical Christian pastor, she is nearly one of a kind.

In 1967, biologists Roger Payne and Scott McVay discovered that humpback whales “sing” and published recordings of the whales’ complex vocalizations, after which “whale song” quickly entered the popular consciousness and helped propel the “save the whales” environmental movement forward.

In our sixth BioLogos videocast, we take a look at the age of the Earth. We explain four methods scientists have used to determine that age: tree ring, lake varve, radiometric, and seafloor spread dating, and also offer some theological insight on how an old earth can fit with the first chapters of Genesis.

In this brief video, Physicist Ard Louis looks at two important aspects of time to consider when reading Genesis 1: chronology and the idea of “deep time”.