I always liked the "Radiological explanation" regarding the Cambrian explosion. Higher-than-normal levels of radiation would provide the mutagenic effects on a

I always liked the "Radiological explanation" regarding the Cambrian explosion. Higher-than-normal levels of radiation would provide the mutagenic effects on all life. Many things would die because of dead-end deviations. I look at the area around Chernobyl at what radiation can do for evolution. Of course, it's pretty terrible for suffering on a whole, but we're talking about evolution. Life gets messy.