I think you're probably correct in thanking God for scientists, in general, since, God created scientists. Whether or not there is an "on board" scientist depends on what you might consider as being "on board".
I have repeatedly asked for quantitative showing of the presence of iodine in walnut oil, but to this date have been offered none.
The fact that walnut oil might not "burn" skin, is not in itself indicative of the presence or absence of iodine in walnut oil, as many oils containing no iodine such as walnut oil do not burn the skin. Even compositions of matter which do contain iodine, do not burn the skin. So the test of whether or not a substance burns the skin or not is not a necessarily valid one for testing for the presence of iodine.
It is only the non-scientists I've come across, who claim there is iodine in walnut oil, who offer no proof of its presence. I think they're a bunch of nuts. Wall-nuts. Wishful wall-nuts.