Transcript 0:07 In 1910, the Antarctic Nimrod Expedition was in trouble. 0:11 Led by Ernest Shackleton, 0:13 the team had set the record for the southernmost point ever reached. 0:17 But after miscalculating how long it would take to return 0:20 to the nearest supply depot, 0:21 the crew had run out of food. 0:24 Fatigued and desperate, they turned to their medical kit. 0:27 It contained a drug called “Forced March tablets,” 0:31 which promised to mitigate hunger and prolong endurance, 0:35...

Transcript 0:00 Ever heard the saying, 0:01 "I'm so hungry I could eat a horse." 0:05 This is the true tale of Terra, a man 0:08 who didn't just have a big appetite. He 0:10 had an unexplainable ability to eat 0:13 anything and everything. 0:16 So, pull up a chair for one of the 0:19 strangest stories in history. Tarrare's early life 0:23 It begins in 18th century Leon, France. 0:27 As a kid, Terra could eat his weight in 0:30 meat by lunchtime. But he was so slim if 0:33 you blinked, you...

Transcript 0:07 You’re sure you know your third grade teacher’s name— 0:10 it’s like you’re hovering over it in your mind, 0:12 but it just won’t materialize. 0:15 Researchers call this tantalizing torment a “tip-of-the-tongue state,” 0:20 and it's something everyone experiences. 0:23 But what's actually happening when a word gets caught here? 0:26 And how can you best get it unstuck? 0:29 Most of the time, our brains seamlessly summon words 0:33 from vast stores of knowledge, 0:35 paring...