The little boy asked his father, "do fathers know more than sons ?"
Dad answered, "of course !"
The little boy asked, "who invented the electric lamp ?"
Dad: "It's Edison ."
The little boy asked again, "then why didn't Edison's father invent the electric lamp ?"
Thinking: it is very strange that people who like to rely on the old and sell the old are especially easy to fight. Old qualification in the era of Yuan open, it is often just an empty shell that can't stand the test.