I have been challenged by one of my commenters, Kev, to prove the existence of a few things. I would normally respond in kind - through a comment, but I'm bored, so I'll take a stab at a few. It should be made clear that the commenter believes in god and I do not. He is challenging me on my logic.
Moral right & wrong
Being that many animals can grasp right and wrong on a basic level, it confuses me that anyone would suggest that morality comes from a holy origin. A dog understands benefit and detriment. Apes have a sense of humor. Elephants show emotions. Dolphin families spread culture. It doesn't take a human to understand right and wrong, so it makes sense that a man-god cannot be the only authority for morality. We, as human animals, have a natural internal sense of what is right and wrong, developed through the evolutionary process.
Human consciousness, the world outside yourself
I categorize this into the same bin as all the masturbatory existential questions we've all heard before. Is it such a leap to assume that... I think, therefore I am? Sometimes challenging reality is nothing more than an attempt to scuttle the debate before it advances onto the really interesting topics.
Love
It is apparent to me that everyone has their own interpretation of what love is. To a ravenous believer, "love" is the obsession they have for their savior. To a romantic, love is the longing they have for the object of their desire. To me, love is an intense loyalty felt toward those who have endeared to me. In any case, as with all emotions, its origin rests with the chemistry of our brains. I cannot prove the existence of something that has a different definition to everyone who has experienced it.
Mathematical consistency to which all things are subject, Chaitin's number
This one has me tickled. As I stated in my entry, Proof of Evolution, nature does NOT adhere to mathematical models. There are no perfect circles, no perfect spirals. The Platonic model is not valid in the real world. I would suggest the book, The Black Swan, if you're interested in understanding the real mathematics of nature.
The existence of black holes, dark matter, strangelets
Strangelets, as I recall, are hypothetical, so nobody claims any proof of their existence, only conjectures. Dark matter is said to be detected through its gravitational effects on other matter. Black holes are detected by their distortion of the light emitted from galaxies farther away, like a giant lens, which bends toward them as it passes by on its way to Earth. They have also visibly devoured whole parts of galaxies, leaving a telltale sign of a massive source of gravity. Similarly, we can detect planets in other solar systems as they pass in front of their home stars and temporarily disrupt the light and radiation that we detect.
I didn't answer all of the challenges, but at some point I have to stop and make a point. There are good reasons for scientists to be doing what they do. First, if the basics of what we understand about our reality are wrong, then we, in turn, would not be able to have the technology that works so precisely in our daily lives. For example, if our understanding of chemistry were off by just a little bit, we wouldn't be able to have digital watches. It's as simple as that. Second, there are many things we don't know, but it is quite a different thing to say that what we DO know is wrong. There's a reason why you leave your house through the front door and not the window.
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