A common species of urban lichen is being promoted as a natural alternative to Viagra, much to the concern of scientists. It can be “somewhat toxic” and also be tainted by inner-city pollutants such as dog urine and excrement, car exhaust, arsenic, mercury and lead.

A common species of urban lichen is being promoted as a natural alternative to Viagra, much to the concern of scientists. It can be “somewhat toxic” and also be tainted by inner-city pollutants such as dog urine and excrement, car exhaust, arsenic, mercury and lead.: https://ift.tt/2KPaaRH Read more... https://ift.tt/2OWGMOo