What is the status of prosthetic limbs in halacha? For example would a prosthetic hand require netilas yadayim? Is there a difference depending on what material it is made out of?
The Shulchan Aruch OC 160:2 rules that water with which one has done "melachah," is disqualified from netilat yadayim. Does this include water which has flowed downstream from a hydroelectric plant?