It is not often you can actually see where the end of a rainbow meets the ground! True story,,,last time I saw that was in the United Kingdom around 1985. I had just been given permission to metal detect by a farmer, we were standing in the back of his 15th century manor while he pointed out which fields he owned. A rainbow formed and the end of it was highlighted by steam rising off the black soil just after a summer shower. Anyway, to get to the point! Not far from that spot but in the same field I found 21 silver medieval coins from the 12th century (a purse loss)! So you can be sure next time I see that event my detector will be with me ready to go!