No, I have never heard the expression used before. I'd happily answer you if, for example, you provide your preferred educational resource to put me in the picture.
Wikipedia tells me the term dates from 1996, long after I left school. The article then says the idea "
was based on the mistaken assumption that evolution relies on improvement of existing functions, ignoring how complex adaptations originate from changes in function, and disregarding published research", which may be as good an argument against as I could come up with if I knew the field.
I note also the sentence "
Irreducible complexity has become central to the creationist concept of intelligent design, but the scientific community, which regards intelligent design as pseudoscience, rejects the concept of irreducible complexity".
Both of the quotes I just used are referenced within the article.
I think my problem is that you refer to "Irreducible complexity" as fact, when it is clearly disputed by people I would give credence to. The subject is on the same level as Flat Earth as far as I can see. Both are matters of belief. I share neither. The Wikipedia article
List of scientific bodies explicitly rejecting intelligent design provides many good reasons for think this outright dismissal to be reasonable.
Perhaps we could start again on the basis that neither of us is allowed to advance a belief as an argument. That way we can only introduce concepts we both agree are factual, I'd be interested to see what common ground we uncover. I'd very much like to do that.
The problem with asking "
how can you explain [the eye] evolving" is that the answer is very long. You start with a patch of skin which is more light or heat sensitive (they're the same thing) than its neighboring skin and then you make it more effective by dimpling it - to concentrate the effect - and increasing its nerve network to add discrimination. It's my understanding that a lot of the evolutionary history of an organ such as the eye is replayed step by step in foetal development, but I may turn out to be oversimplifying with that notion. On the other hand, perhaps I'm not.
If every single developmental step in evolving an eye improves the chance of passing on copies of an individual's genes then bingo, add time and you get an eye. The world-view of Intelligent Designers is being squeezed into narrower and narrower spaces as each of these developmental steps is uncovered and shown to be incrementally beneficial. The bogus part of your question is "
if hundreds or thousands of parts have to be in place at the same time for something to be useful". Plainly they don't. The end state is not implied in the initial steps, the simple initial steps themselves are significant aids to survival.
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