A team of scientists studied families in an area of India which receives 10 times more natural radiation than the global average. When they looked at:

"a non-coding region of the DNA where mutations have no effect on health or on any other visible features...

...The scientists identified 22 mutations in the mitochondrial DNA sequences of families living in the high-radiation area. By comparison, a control population living on white sand nearby only had one mutation."

[ Mitochondrial DNA is inherited only from the mother and can be used to determine whether a mutation is passed on from the mother to her descendents. ]

The evidence for inherited mutations is mounting. How long before scientists make the link between evolution and mutation-causing comsic rays?