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Logo design credit goes to: tubbadu
Add ability to see what color magenta actually is.
it's...something between blue and red (and a little bit green)
dual redundancy for every organ, and the ability for a damaged or removed organ to grow back.
Just make it repair as well as the "immortal" animals out there (they can obviously die of accidents or diseases but not of old age).
I'd like to make bodily functions a bit less gross.
I think they are fairly well-designed. You have to be able to expel solids and liquids somehow, otherwise they'd build up inside you, and you might die if they couldn't be digested or sweated out. I guess they could be combined, like birds. But I don't think that would make it less 'gross' in a non-quantifiable way. Sweating is also a pretty effective way of cooling down. Other methods such as large ears as radiators, thin blood vessels on the forearms that must be licked to aid in heat transfer, and panting all have their downsides.
If you think about it, tailpipes on cars and vapor pipes on AC and heatpumps and furnaces are basically the same thing as our digestive system.
The only thing that could really be redesigned is to have them be much more efficient, like some animals, which can pull a lot more water and nutrients out of byproducts. That, and the ability to extract stuff like heavy metals, microplastics, and forever chemicals, which get stuck and can't always leave.