Using sharks to study ocean oxygen, and what ancient minerals teach us about early Earth

<p>On this week’s show: Shark tags to measure ocean deoxygenation, and zircons and the chemistry of early Earth</p> <p>First up this week: using sharks to measure ocean deoxygenation. Contributing Correspondent <a href="https://www.science.org/content/author/warren-cornwall">Warren Cornwall</a> joins us to talk about a group of researchers putting <a href="https://www.science.org/doi/10.1126/science.adg9640">data logging tags on sharks</a> in order to study how climate change is affecting oxygen levels in some of the ocean’s darkest depths.</p> <p>Next up, what can 4-billion-year-old minerals teach us about chemistry on early Earth? Producer Meagan Cantwell talks to geochemist Dustin Trail about using minerals called zircons to deduce the <a href="https://www.science.org/doi/10.1126/science.adc8751">chemical properties of the early hydrothermal pools</a> where life began.</p> <p>This week’s episode was produced with help from <a href="https://podigy.co/">Podigy</a>.</p> <p><a href="https://www.science.org/content/page/about-science-podcast">About the <em>Science</em> Podcast</a></p> <p>[Image: David Salvatori/VWPICS/Alamy Stock Photo; Music: Jeffrey Cook]</p> <p>[alt: Underwater photo of mako shark with podcast symbol overlay]</p> <p>Authors: Sarah Crespi; Warren Cornwall; Meagan Cantwell</p><p>See <a href="https://omnystudio.com/listener">omnystudio.com/listener</a> for privacy information.</p>