It is impossible to eat what nuts
Far not all kinds of nuts are authorised for selling in a shell. For example, keshju necessarily should be cleared: between a shell and a cover of this nut there is the poisonous substance, capable to cause heavy burns.
If, splits wood or a walnut, you notice under it a pollen cloudlet, throw out without a regret: under influence plesnevogo a fungus in kernels cancerogenic substances – aflatoksiny are developed.