 All of the following is 'recycled' to create extra 'food' EXCEPT for:
The Triton made her underwater periplus of Earth with a galley stocked with frozen pizza and concentrated apple-juice. The earliest men into the vacuum swallowed protein squeezings from aluminum tubes, and were glad enough to drop back to the groundsman's diet of steak and fried potatoes. It's the Cook's responsibility to see that each man aboard gets each day no less than five pounds of water, two pounds of oxygen, and one-and-a-half pounds of dry food. All waste was used to fertilize our liquid fields. The algae—dried by the Cook, bleached with methyl alcohol to kill the smell and make the residue more digestible, disguised and seasoned in a hundred ways—served as a sort of meat-and-potatoes that never quite wore out.
 bones
 urine  hair  algae  bones