For Christmas this year I got a copy of "A Short History of Progress" by Ronald Wright (my dad's obviously noticed my recent interest in the natural sciences). I'm currently on my second read-through, and will probably write another post about it at a later time.
I missed it on the first read because embarrassingly I assumed the "nape" of the neck was at the front, but this time I noticed the following quote which is in the context of considering whether we evolved purely from Cro-Magnons, or whether some of us have Neanderthal blood ties too.
I also have personal evidence that Neanderthal genes may still be with us. A few modern people have telltale ridges on their heads. I happen to have one - a bony shelf across the back of the skull that looks and feels like the Neanderthal Bun. So until new findings come along to settle the matter, I choose to believe that Neanderthal blood still flows, however faint, in the Cro-Magnon tide.
Someone suggested that would explain why I have "Mr Tickle" arms too.