half baked ideas

Adapt an inject printer to print tattoos directly onto skin. (btw Inject technology is already used to print half strands of DNA).

Have the inside of a tube of toothpaste cling to itself so that it is easy to expel all of the paste.

Create a 'nap' watch which can determine the stage of sleep you are in so you are never woken during stage 3 or 4 deep sleep.

Create a 'void balloon'. That is, a sturdy shell (probably from some nanostructure) which is strong and light enough to create a void inside. This 'void' will have more lifting capacity than Helium or Hydrogen in atmosphere. Additionally, this is 'green' in that no gases need to be mined/synthesized.
-- with enough technology a 'morphing' balloon could transition from round->airplane shape->supersonic airplane shape etc, for optimal performance depending on velocity, function and altitude.


Create a flying craft, the skin of which creates corona wind via high voltage potentials for propulsion and maneuvering.
(update: it seems they've already done a similar idea for ship propulsion. See "Magnetohydrodynamic drive".)