Acoustic streaming (AS) is a phenomenon discovered by Faraday and later analyzed mathematically by Rayleigh. It is a somewhat undesired effect in medical ultrasound. In the 90' it was shown that it could be used in micro scale for pumping and mixing. This is now a mature technology. We speculated that certain algae have used AS 4.5 gyr ago. In this talk we review the phenomenology and the basic mathematical formulation as presented by Nyborg in the 50's. We discuss a geometry that we believe has good prospect. We are currently also preparing an experiment at the Brazilian Metrology Institute (INMETRO).