I love walnuts. Today I got some at Dolac, the central open market in Zagreb. Carefully cracked, the walnuts yielded kernels of perfect shape. And they cannot but remind me of the brain. The problem of filling a roughly spherical shell with growing tissue is common to both. Compared to one another, all of the walnut kernels have a similar structure, just like brains. There is a ridge in the middle, there are bulges on the sides, and there is a strong symmetry between the left and right sides. Of course, the brain is only a half of a walnut kernel, but the likeness is still striking. However, I doubt that much is known about all the features of a walnut kernel. I doubt that they have acquired glorious names such as thalamus, corpus callosum, and medulla oblongata. What if all these features were eventually discovered in walnut kernels, though? Walnut intelligence would surely be a hit. And it would quickly change our eating habits, no doubt.