The world's tiniest Rubik's cube is as wide as 3 grains of rice

The makers of the Rubik's cube went small to celebrate the iconic puzzle toy's 50th anniversary. Thanks to a collaboration with Japan-based Megahouse and Iriso Precision Company, designers have completed what is now the official Guinness World Record holder for the "smallest rotating puzzle cube." But even at just 0.5 cm (0.19 in) wide, the miniscule Rubik's is totally functional--although you'll likely have difficulty handling a device that's roughly the width of three grains of rice. To assemble the newest take on the cultural touchstone toy, engineers relied on a combination of fine-tuned machinery and human talent. First, the underlying foundation to the mini-Rubik's cube is what's known as "micro cutting."