What hurdles must humanity face before it can inhabit the final frontier? "A City on Mars" co-author Zach Weinersmith is here to ground us with the facts.

944: Zach Weinersmith | Out-of-This-World Hurdles to Colonizing Mars

(Apple's Best of 2018) In-depth conversations with people at the top of their game. Jordan Harbinger unpacks guests' wisdom into practical nuggets you can use to impact your work, life, and relationships. Learn from leaders (Ray Dalio, Simon Sinek, Mark Cuban), entertainers (Moby, Tip "T.I." Harris, Dennis Quaid), scientists (Neil deGrasse Tyson, Bill Nye), athletes (Kobe Bryant, Dennis Rodman, Tony Hawk) and an eclectic array of fascinating minds, from art forgers and arms traffickers to spies and psychologists.

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What challenges can the ocean help us meet, and what must we do to safeguard its treasures? The Underworld author Susan Casey dives deep for answers here!

984: Susan Casey | Unraveling Mysteries in the Ocean's Darkest Depths

Your brother's never-ending barrage of goat-related songs, text messages, and references has your family concerned. Welcome to Feedback Friday!

983: Bro's Obsessed with Goats: What's the Antidote? | Feedback Friday

Should we worry that the complex dynamics between Israel and Iran might ignite WWIII? Intelligence analyst Ryan McBeth brings us in from Out of the Loop.

982: Israel vs. Iran | Out of the Loop

Grab a front-row seat to the gritty world of bare-knuckle boxing with undefeated champ Bobby Gunn and his 'Bare Knuckle' biographer Stayton Bonner here!

981: Bobby Gunn | The 73-0 Undefeated Bare-Knuckle Boxer

Your pregnant sister-in-law was a wild child growing up and suffers addiction. Would adopting her baby disrupt your family life? Welcome to Feedback Friday!

944: Zach Weinersmith | Out-of-This-World Hurdles to Colonizing Mars

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