Brighton TID
New member
I'm not knocking the fact that I have two kidneys, I may need them both one day, and many folk rely on the second one for medical reasons. Just wondered, though, what makes kidneys so special to warrant us having two. Why is only one heart and liver provided when they are equally as vital to our functioning as kidneys? Do you think God over designed as he saw kidneys as a bit of a weak human component, requiring the option of a spare?