On Monday I mentioned that sexual reproduction poses a very difficult problem for Darwinian evolutionists who believe that such a process developed gradually in a step-by-step fashion. That such a complex means of reproduction would arise when a much simpler asexual method already existed is a troublesome enigma for evolution.
Here's another: bioluminescence. Numerous creatures have it, but how and why it came about is very perplexing on any naturalistic view of things.
There's no apparent selection pressure for such a feature, many creatures get along just fine without it, yet it appears in organisms from crustaceans to insects to fish.
This brief video explains how bioluminescence works in one very common insect - the firefly. Enjoy this excellent presentation of the biology and chemistry behind nature's own fireworks display:
