Ever heard of “hitting the wall” during a marathon? This is what happens when your body runs out of stored energy, and your brain goes into protection mode. Here’s exactly how it happens! 🧠 We’re revisiting this @okaytobesmart where @drjoehanson runs a marathon! Have you ever “hit the wall”? Share with us in the comments! | PBS Digital Studios

96K views · 27 reactions | On April 10, 2019, astrophysicists from the Event Horizon Telescope collaboration electrified the world with the first ever image of a black hole. How did that happen? Joe Hanson from It's Okay to be Smart • PBS shows us how it took telescopes working together all over the world to make it happen. | PBS Digital Studios | Facebook

111K views · 212 reactions | A year ago today we lost The King of the Blues at the age of 89. The blues legend said he played 300 nights a year for four-plus decades. From Blank on Blank, this video shows his key tips to living life to the fullest. | PBS Digital Studios | Facebook

79K views · 329 reactions | The world is full of monsters, myths, and legends. Meet them in Monstrum, a new series from PBS Digital Studios starting Thursday. For more #GreatReadPBS content, follow Great American Read • Watch Episodes • PBS! | PBS | Facebook

163K views | Explore why we love to read with video essayist Lindsay Ellis. Join us and PBS Digital Studios for It’s Lit! on Mondays, starting June 4. #GreatReadPBS | PBS | Facebook

20K views · 514 reactions | You are invited behind-the-scenes of the ball! #Cinderella is on Blu-ray & Digital HD now. | Walt Disney Studios | Facebook

17K views · 43 reactions | Hip Hop don't stop!  Celebrate the 50th year of Hip Hop with a break down from some of the most iconic figures in the genre. Fight the Power: How Hip Hop Changed the World premieres Tue, Jan 31 at 9/8c. #FightThePowerPBS | PBS Digital Studios | Facebook