"While the human body has never been equaled [in] all-around master engineering, a number of glaring weaknesses do exist in man's basic equipment," stated a Mechanix Illustrated article from August 1956, which enlisted experts to suggest upgrades.
I'm not sure how serious this is, but it certainly reflects the design mentality of 50 years ago: If something doesn't work right, it must be lacking features. Here are the most unexpected add-ons recommended by industrial designers, anthropologists, engineers and biologists:
• Folding ears, something like the old-fashioned ear trumpet, to catch low-pitched sounds
• Hooks on heads for straphangers on subways who wanted to read the papers
• A device resembling a giant clamshell can protect internal organs and be opened easily for surgical purposes
• 20 teeth would be an improvement over the present 32, according to dentists
• A long snout to do away with the nose's confusing air flow and related sinus troubles
• Detachable arms so that you can sleep in comfort
• An extra pair of hands coming out of ears to hold hats in high winds
• Antennae concealed in the head that could pick up sound waves, lights and shadows
• A protective covering for the eye, containing substances which would screen out harsh ultra violet rays
• A small food storage compartment like the camel's
• Built-in pockets, such as kangaroos have
• The spine as a solid column, to greatly increase load-carrying capacity and protect vital nerves
Only this last one comes with an admitted downside: "Man would not be able to twist and turn as he does now but the semi-flexibility of the cylinder would allow enough bending for every ordinary purpose." Meanwhile, the only one from the list that may actually be a product soon—the UV protective eye covering—was a suggestion "meant frankly for fun."