Amazing what one can learn by experiment

In the 17th century, French Natural Philosopher Jean-Jacques Bouchard tested the alarming claims made by Lemnius and Rodericus a Castro about menstrual blood. Bouchard found that in fact menstrual blood did not kill grass, did not tarnish mirrors, did not blast the buds of the vine, did not dissolve asphalt and did not produce ineradicable spots of rust on the blade of a knife.[1]