They were imported to eat algae and other microscopic organisms.

VOA: special.2009.12.15

He says the next step is to develop microscopic nano-particles.

VOA: special.2010.03.16

The tiny silicon wires stick up from the base,or substrate, looking something like a microscopic hair brush.

VOA: standard.2010.02.19

The volcano has sent a massive cloud of microscopic ash particles swirling across northern Europe - particles that air specialists say are highly abrasive and could cause aircraft engines to fail.

VOA: standard.2010.04.16