There is so much we have yet to learn about our own world and society, but while we are able to design experiments to answer some of these questions, ethics prevents us from performing them all. Wired has a great list of experiments that could teach us a whole lot about our world, but simply can't be performed because they're just plain wrong.
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I couldn't even skim through the first four...
I don't know, what's the point of an animal? Any animal? Including humans.
Eat. Sleep. Reproduce. Rinse. Repeat.
There is no meaning to life that I know of (except this really basic survival instinct)
If properly trained, they don't bite, they are not skittish like a hamster or gerbil can be. They can give "kisses", and will stay by you for hours on end.
They don't run away (even if out of the cage), and I trusted my small daughter to hold & play with ours without constant supervision. They are sturdier than a hamster, they can take more handling than the smaller rodents can.
Plus they eat all of your vegetable scraps, and if you use their waste in the yard, you have great fertilizer.
Any pet can bring you joy, it just depends on your likes & dislikes.
I mean, with the consent of the human in question, of course.