![KEXP Presents Mind Over Matters Sustainability Segment show](https://d3dthqtvwic6y7.cloudfront.net/podcast-covers/000/041/996/small/kexp-presents-mind-over-matters-sustainability-segment.jpg)
Summary: Guest Caleb Scharf, Director of the Columbia Astrobiology Center, speaks with Diane Horn about his book "Gravity's Engines: How Bubble-Blowing Black Holes Rule Galaxies, Stars, and Life in the Universe."
Summary: Guest Caleb Scharf, Director of the Columbia Astrobiology Center, speaks with Diane Horn about his book "Gravity's Engines: How Bubble-Blowing Black Holes Rule Galaxies, Stars, and Life in the Universe."