The burning pen

I was thinking how it would be nice to have pens that burn the paper using laser maybe at close range. This way there is no need for ink or graphite in order to write and the writing would be permanent or semi-permanent. Also things could be written on many different types of surface.

Flash Dongles or Modules with displays

I wonder why they don’t put displays on Flash Dongles or Modules to show if they are full and how much data is already in them or maybe show a list of the files inside.