I was being lazy, Big Dave is giving a better answer. I will try to help too. There are things to know about wood and it's characteristics before a guy goes making slab tables, and he should do his research. Dave hit the nail on the head with his comment about grain. If you look at the walnut table that slab is all heartwood and it is the second board off the exact center of the tree (I know cause I sawmilled it :laughing Again with the curly maple slab, it is a very stable wood because of its species, way it was sawn and interlocking curled grain.I know there are concerns in wide board construction..