tak to mas slabu predstavivost, otvor sa trochu moznostiam..
napr. toto bolo pre mna tiez takmer nepredstavitelne (a takych veci nevidime strasne strasne vela):

  http://www.ted.com/talks/george_whitesides_a_lab_the_size_of_a_postage_stamp.html

Traditional lab tests for disease diagnosis can be too expensive and cumbersome for the regions most in need. George Whitesides' ingenious answer, at TEDxBoston, is a foolproof tool that can be manufactured at virtually zero cost.

edit:
dalsi priklad 'Handheld HIV Detector for $250'
http://www.insidescience.org/research/building_a_handheld_hiv_detector