Board Thread:Off Topic/@comment-24694044-20150212193625/@comment-25941663-20150324120005

Chronobunny wrote:-stuff- I really hope you are joking. You certainly made me laugh.

While it is true that we cannot prove that we percieve the world the way it really is, based on our perception of the world, we can prove all the stuff you pointed out.

We do know that the Earth is round (sort of). That is based on physics. Earth simply cannot be flat. I think earth could have been a cube, but I'm not that sure.

We do know that gravity exists. We can see its effect on our world. Granted, we don't know much about gravity, it is a large mystery, but we do know that there is something out there that causes masses in our universe to attract each other. We call that 'something' gravity.

Colour is how our eyes 'translate' a certain wavelength of light (simply put). It is true that my yellow might not be your yellow, but that means nothing. We have simply called 'yellow' the light that has a wavelength of about 600nm.

We can actually categorize animals into species based on how similar their features are and by their ability to reproduce with each other and 'give' fertile descendants (among some other criteria).

Those are all facts based on our perception of the world. Of course, that perception might simply be an illusion, but that is more philosophical than science.

Oh, and Pluto isn't a planet not because it is a ball of ice, but because it's very, very small. I think it has about the same surface area as Russia. So yeah, it's considered a dwarf planet.