and then paint certain ties white and other black, now you have the world's bigg... | Hacker News

Hacker Newsnew | past | comments | ask | show | jobs | submit

fnord77 23 days ago | parent | context | favorite | on: Using the railway network as a flatbed scanner [vi...

and then paint certain ties white and other black, now you have the world's biggest barcode

Guidelines | FAQ | Lists | API | Security | Legal | Apply to YC | Contact