81. Why Bother Searching for Aliens?

<p>Michael Greenstone knows it’s corny, but he wants to make the world a better place — by tracking the impact of air quality, developing pollution markets in India, and … starting a podcast, which Steve says proves he’s over the hill.</p><p> </p><ul><li><strong>SOURCES:</strong> ... Show More

<p>Suleika Jaouad was diagnosed with cancer at 22. She made her illness the subject of a <i>New York Times</i> column and a memoir, <i>Between Two Kingdoms.</i> She and Steve talk about what it means to live with a potentially fatal illness, how to talk to people who've gone thro ... Show More

<p>Physicist and former pop star Brian Cox tells Steve about discovering the Higgs boson, having a number-one hit, and why particle physics research will almost certainly not create a black hole that destroys all life on earth.</p><p> </p><ul><li><strong>SOURCES:</strong><ul><li> ... Show More

<p>If television shows and movies are any indication, we humans spend a lot of our time subconsciously preparing for UFOs carrying maleficent aliens to descend on Earth. But should we rush to create an intergalactic battle plan? In actuality, finding otherworldly life won’t be so ... Show More

A US government report on UFOs has said there was no clear explanation for the unidentified aircraft, but did not rule out extra-terrestrial origin. Hundreds of millions of dollars have been invested into searching for signs of alien intelligence. Ed Butler speaks to Lisa Kaltene ... Show More

<p>Astrophysicist and TED Fellow Sarah Rugheimer searches for aliens -- but not the cartoony green kind. She's looking for extraterrestrial microbes by studying how these single-celled organisms emit gases, which could reveal evidence of them throughout the cosmos. Wondering if w ... Show More

Half a mile below the surface of the earth, in a cave too hot to explore without an ice-packed suit, NASA scientist and Nat Geo explorer Penny Boston clambers around glassy crystals that are taller than telephone poles and wider than dinner tables. But it's not The Crystal Cave's ... Show More

Our 150th episode is coming up! To celebrate, we’re doing a quiz show with trivia from all 9 seasons of Tumble! Get entered to be on the show: Sign up now to become a Tumble Patreon on patreon.com/tumblepodcast, and tell us why you would make a great contestant! (Microphone licki ... Show More

Could human engineering stabilise the Earth's climate and chemistry in the long term? Tim Lenton of Exeter University explains why the Gaia hypothesis is the key to understanding the future of life on Earth. But what about life beyond Earth? Justin Rowlatt speaks to astronomer Li ... Show More

Melvyn Bragg examines Extra Terrestrials. New planets have been observed far beyond our solar system and telescopes are being built that will enable us to look for water and oxygen on these distant planets. If water and oxygen are present, there is every reason to suppose that so ... Show More

Einstein and astrophysicists have long theorized the existence of wormholes throughout the universe allowing humans to travel across time and space within minutes or hours. In Stargates, Betsey Lewis, Earth Mysteries Investigator for nearly 50 years, reveals for the first time th ... Show More

<p>Fragments of a map from the 1500s sparked a theory that’s been going strong for decades. It holds that extraterrestrials have been visiting Earth for thousands of years, gifting humans with advanced tech far beyond our means. Today we investigate the mysteries that make aliens ... Show More