This morning I was preparing some 2" thick blanks for a Beads of Courage box/lidded bowl demo for this weekend when I found this in a walnut 8/4 board. A walnut nut evidently fell into a crevice in a walnut tree and the tree grew around it. I've seen unusual things in logs and boards before but this is a first for me. It looked a little more like a nut before I ran it through the planer but I didn't think to take a picture of it then.
I've had this and some other boards from the same tree for maybe 30 years and this was the first time I looked at them closely!
The nut looked like it was past it's prime.
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JKJ