![Cliff Pickover on Twitter: "Ancient Sam Loyd puzzle. "Show the route from Philadelphia to Erie, passing through all the towns but once." https://t.co/qQJmDjkx8R" / Twitter Cliff Pickover on Twitter: "Ancient Sam Loyd puzzle. "Show the route from Philadelphia to Erie, passing through all the towns but once." https://t.co/qQJmDjkx8R" / Twitter](https://pbs.twimg.com/media/B5_rFfVCUAA9s9b.jpg)
Cliff Pickover on Twitter: "Ancient Sam Loyd puzzle. "Show the route from Philadelphia to Erie, passing through all the towns but once." https://t.co/qQJmDjkx8R" / Twitter
![More Mathematical Puzzles of Sam Loyd (Dover Recreational Math): Amazon.co.uk: Gardner, Martin: 0800759207091: Books More Mathematical Puzzles of Sam Loyd (Dover Recreational Math): Amazon.co.uk: Gardner, Martin: 0800759207091: Books](https://m.media-amazon.com/images/I/61f48QYYhQL.jpg)
More Mathematical Puzzles of Sam Loyd (Dover Recreational Math): Amazon.co.uk: Gardner, Martin: 0800759207091: Books
![This is THE DISAPPEARING BICYCLIST puzzle by 18th Century mathematician Sam Loyd. In position 'A' 13 boys are visible, but in position 'B' - only 12. One is invited to determine which This is THE DISAPPEARING BICYCLIST puzzle by 18th Century mathematician Sam Loyd. In position 'A' 13 boys are visible, but in position 'B' - only 12. One is invited to determine which](https://external-preview.redd.it/6q2rOUSJjSHmCwWLay06nxbqDRCLvXU3Udr3gykAW98.png?format=pjpg&auto=webp&s=15a5df5f67c7f246c37228a893adcd218e9f175b)
This is THE DISAPPEARING BICYCLIST puzzle by 18th Century mathematician Sam Loyd. In position 'A' 13 boys are visible, but in position 'B' - only 12. One is invited to determine which
![Map, Novelty, Get Off the Earth Puzzle, Cartographic Curiosity, Antique, 1918 – George Glazer Gallery, Antiques Map, Novelty, Get Off the Earth Puzzle, Cartographic Curiosity, Antique, 1918 – George Glazer Gallery, Antiques](https://www.georgeglazer.com/wpmain/wp-content/uploads/2018/05/getoffearth1.jpg)