I stopped reading when they used a comically bad simile: > Think of the brain’s sensitive periods as blown glass: The molten glass is very malleable, but you h

I stopped reading when they used a comically bad simile: > Think of the brain’s sensitive periods as blown glass: The molten glass is very malleable, but you have a relatively brief time before it cools and becomes crystalline. Put it back into the furnace, and it can once again change shape. (the definition of a glass is that it is noncrystalline).