@Talyaa for the arm, I'd much rather go organic. Oh sure there's times when having a go-go-gadget fingertip screwdriver would be handy, but not nearly as cuddly and prone to inadvertent activation (”what the hell happened to your nose?!?"). even the lasers can be biologic (see http://www.nature.com/nphoton/journal/v5/n7/full/nphoton.2011.99.html) so I'll settle for just being a monstrous abomination of physiology (but a friendly one).