Key points from article :
Cornell University has built microsensors so tiny, 30,000 fit on a penny.
Equipped with an integrated circuit, solar cells and LEDs.
Designed so that they can be mass produced - millions at a time.
Use light as a potential power source and communication medium.
Could be used to measure temperature inside living tissue.
Has already been demonstrated to wirelessly track temperature in brain tissue.
OWiC Technologies has been launched to commercialize the microsensors.
Research by Cornell University published in PNAS.
