Up Is Down

Do you know the Pixar movie "Down"? Well of course you don't, because it's actually called "Up"!

There is a theory that states that Up is down. But what does this really mean? Does this mean that there is no real set direction? Let us take a look at some examples.

If you think about the number system that we use today, negative numbers exemplify this case. When you have low negative numbers, you are actually going "up" the number scale. Likewise, with the pH scale, when you go "up" the scale, the concentration of hydrogen ions is decreasing (Ask Jeeves).

Okay, what about actual directions of up and down? What shape is the world we are living in? What happens when one keeps walking north, or in other words, "up"? According to Wikipedia, "the world is round". To put in other words, if one keeps walking north, eventually he or she will be heading south ("down"). Same goes for if one keeps walking south, they will eventually be heading north!

All comes to prove that Up is indeed down!