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How much can you jam into a human brain? How far can you push yourself past feelings of exhaustion? We examine human limits. We talk to Ironman tri-athletes and hear the memorable tale of a man who couldn’t forget. Are we limited by the size of our brain and the strength of our muscles, or will there always be a way to push ourselves just a little bit further? And what about human comprehension? As science barrels forward, will we reach the limit of human understanding?

Listen or learn more about this week's episode of Radiolab.

Banner image of Valley of Fire State Park, near Las Vegas, Nevada: Marcel Tuit