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<p>This week, two conversations from the archives about parts of the world that are imperceptible to us, verging on almost unthinkable. We start with a moment of uncertainty in physics. Inspired by an essay written by physicist and novelist Alan Lightman, called <a href="https://harpers.org/archive/2011/12/the-accidental-universe/"><i>The Accidental Universe</i></a> (<a href="https://zpr.io/4965dUdNqtpQ" target="_blank"><strong>https://zpr.io/4965dUdNqtpQ)</strong></a>, taken from a book of the same name. Former Radiolab co-host Robert Krulwich pays a visit to Brian Greene to ask if the latest developments in theoretical physics spell a crisis for science. He finds that we've reached the limit of what we can see and test, and we’re left with mathematical equations that can't be verified by experiments or observation.</p><p>Then, come along as we kick rocks. And end up tumbling down a philosophical rabbit hole where the solid things around us might not be solid at all. We talk to Jim Ho...