MotionTools and the Air Mouse app enable a presenter to turn their computer's cursor into a highlighter, laser pointer or pen.

ENGADGET: Movea turns your iPod touch or iPhone into an Air Mouse for just $2

Working independently, these three men provided the parts that, when put together, enable the elimination of one gene at a time from the genetic make-up of a mouse.

ECONOMIST: The 2007 Nobel science prizes