For most of our planet’s existence, the Earth was quiet. The boisterous sounds of life we know today are a recent development, one that the growing field of bioacoustics is helping us understand and interpret. In this episode, we travel to Australia to listen to dolphins and meet the microbes that helped usher in life on the planet.Threshold is nonprofit, listener-supported, and independently produced. You can support Threshold by<a href="https://www.thresholdpodcast.org/donate" rel="noopener noreferrer" target="_blank"> donating today</a>. To stay connected,<a href="https://www.thresholdpodcast.org/newsletter" rel="noopener noreferrer" target="_blank"> sign up for our newsletter</a>.We want to hear from you! Send us your questions about the new season, the content or how it’s made, for an upcoming behind-the-scenes episode. You can submit your questions to <a href="mailto:outreach@thresholdpodcast.org" rel="noopener noreferrer" target="_blank">outreach@thresholdpodcast.org</a> Mentioned in this episode:<a href="https://threshold.captivate.fm/donate">Donate</a>

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