"...Cockroaches, which are one of the most venerable living insect groups, have remained more or less unchanged since the Permian, yet they have undergone as many mutations as Drosophila, a Tertiary insect." (Pierre-Paul Grassé, Evolution of Living Organisms, New York: Academic Press, 1977, p. 87) The Permian Period comprises the era of time between 290 and 248 million years ago. In the above extract, Paul Grassé states that on the one hand, mutations—one of the imaginary mechanisms of evolution—do not actually exert the effects of which evolutionists dream. On the other hand, he notes that cockroaches have not undergone the slightest alteration over hundreds of millions of years. Cockroaches that existed 290 million years ago, those like the one pictured that lived about 100 million years ago, and those still alive today are all identical to one another. Faced with this fact, evolutionists have no alternative but to retreat into silence.