You show 2 identical small rods and give one of them to your audience.
You ask him to bend the rod by applying pressure on the 2 ends. He fails.
You show your rod and bend it successfully.
You show 2 identical small rods and give one of them to your audience.
You ask him to bend the rod by applying pressure on the 2 ends. He fails.
You show your rod and bend it successfully.