Posts Tagged ‘theory’

Just a theory…

May 30, 2013

just a theory



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New Rule

May 29, 2013

monicks-net-new-rule



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Evolution

January 12, 2011

Evolution.

This is a subject that seems to make a lot of people either really happy or really mad.
The bible can’t possibly be true if Evolution is true, so religious people refuse to believe in it.  The fact of the matter is, Evolution is undeniably true.

First off, people usually criticize Evolution because they say “it’s only a theory”.  The thing that is weak with this argument is that the argument doesn’t hold ground because a theory in science is very different than a theory you would use in everyday conversation.   The dictionary defines theory as “ an unproved assumption”, in science a theory is the highest degree of certainty.  Gravity is “just a theory”.  The Earth orbiting the Sun is “just a theory.”  By definition, a scientific theory is a hypothesis which has withstood rigorous testing and is well-supported by facts.  There is overwhelming evidence for evolution, just as there is overwhelming evidence for gravity.

Why isn’t Evolution a Law?  This is an issue which often confuses the general public, as the two words have very different common meanings.  But in science, their meanings are very similar.  A theory is an explanation which is backed by “a considerable body of evidence,” while a law is a set of regularities expressed in a “mathematical statement.”  This is why Newton’s Laws of Motion are referred to as laws and not theories.  They are expressed with simple equations (like f = ma for his 2nd Law of Motion).  Evolution, and most of Biology, cannot be expressed in a concise mathematical equation, so it is referred to as a theory.  A scientific law is not “better” or “more accurate” than a scientific theory.  A law explains what will happen under certain circumstances, while a theory explains how it happens.

Now, to Evolution.  The definition as google says is “A gradual process in which something changes into a different and usually more complex or better form.”  This started billions of years ago with single cell organisms which gradually made themselves better and eventually turned into everything you see on Earth today.  Not only has the fossil record proven that we have evolved over time but we can now test this using DNA which also proves that we have all evolved from other animals that lived before us.  A lot of people who don’t agree with Evolution will say “When I see monkeys give birth to humans then I will believe in Evolution.”  The problem with that phrase is a monkey didn’t one day give birth to a human. Why there are still Chimpanzees/apes Evolution is small changes over a period of time, it took millions of years for the humans you see on Earth today to come about.   We didn’t even come from the monkeys you see on earth today, we had a common ancestor which scientists believe lived around 5 – 8 million years ago.  This common ancestor diverged into two separate lineages.  One of these lineages ultimately evolved into modern day gorillas and chimps, and the other evolved into early human ancestors called hominids.  We have gone through several changes since then, more commonly known are Homo Habilis, Home Erectus, Home Neanderthalensis.  We have fossils to prove this, we didn’t just make this up and write in a book and say “See, it’s in a book – it has to be true!”

Some of you may wonder why none of those species still exist, this is because of a thing called “Natural Selection.”  This is basically “Survival of the fittest.”  If a giraffe is born with a longer neck than it will be able to reach hire leaves on the tree and be able to survive longer because of a longer neck.  The shorter necked giraffes will slowly die out because they can’t compete with the longer necked giraffes.  This is a main driving force of evolution, small changes that gives the new creature a small advantage to living.  This has been seen and viewed in science labs.  For instance, germs and diseases have adapted to medicine and antibiotics and get stronger all the time – which is why we are constantly making new vaccines and stronger antibiotics.

We know this is all true because it has been tested and tested again.  Scientists can date the earth, date fossils and everything lines up perfectly for the earth being somewhere around 4.6 billion years old.   A lot of people say that Carbon dating or radiometric dating isn’t very reliable.  The thing is, there is several different dating methods and they all hold up against testing and have been proven to work.  Radiometric clocks include; Samarium-neodymium dating, Potassium-argon dating, Rubidium-strontium dating, uranium-thorium dating, Radiocarbon dating, fission dating, Chlorine-36 dating.

Evolution from the beginning to present day

[youtube=http://www.youtube.com/watch?v=-ONwp56pMBE]

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