We use the keyboard to write using a computer. Pressing the letters types the word we want to use. Pressing the spacebar adds a space. Then we can type our next word. When we start a new sentence ...

Tsubasa Yumura, a computer science researcher in Japan, rigged up a keyboard that looks like it launches letters into the computer when they're pressed. It uses a technique called projection mapping.

The street address, city, state and ZIP code will suffice. Skip a line and date your letter. First, write out the month, then add the day and the year. For example, write the date as July 09 ...