How Good Is Your Eyesight?

If large-print magazines are for elderly people, how young do you have to be to read this book?

Canadian researchers say they have produced the world's smallest published book, a story of a turnip contest that will require readers to use an electron microscope.

The book, entitled Teeny Ted from Turnip Town, measures 0.07 mm by 0.10 mm and was made using a focused gallium-ion beam to carve out spaces around each letter on pieces of crystalline silicon, according to Simon Fraser University.

70µm by 100 µm. That's teeny, all right!