I brought the top of an acorn.
It was comprised of these little squiggly spaghetti-like things.
It was a bit tough capturing the stereo pair because the acorn kept moving around. Donna said this was because it was a bit large and the electrons were hitting it and causing it to shift a bit. In the end the stereo really just captured the movement of the acorn around on the surface, but I think it creates an interesting effect. It was pretty unexpected to see the acorn top made up of this kind of structure and was cool to be able to zoom way into it.
On the inside cross-section of the acorn there were these dead cells.