<p>This week I learned how the good cop/bad cop routine works, that dads also go through hormonal changes after becoming parents, that fish &quot;talk&quot; with their urine, and that Earth has a secret hidden eighth continent.</p>

37: This week I learned the unexpected ways an asteroid could kill us all, and more

Your audio guide to the most fascinating and fun revelations, reports, and studies on the internet. Quick, concise, and infectiously entertaining, This Week I Learned promises to make learning fun again.