“Pushing the envelope” is an aviation expression that refers to how test pilots received instructions to challenge the known limits of flight. These instructions, if not a death sentence, were very often a flirtation with disaster. The gravity of issuing such an order was understood but not spoken. Instead, the impersonal assignment came within an envelope, silently slid or pushed across a desk from one man to another.
The funny bone exists in your body, but it’s not a bone at all! The funny bone is a part of the ulnar nerve located at the back of the elbow. If you accidentally bump this area it can cause a tingling sensation toward the front of your forearm.
This tingling or dull pain is caused by the ulnar nerve bumping up against the humerus, the long bone that starts at your elbow and goes up to your shoulder. Although it might feel weird, tapping your funny bone doesn’t do any damage to your elbow, arm, or ulnar nerve.