So – what causes us to blush? Why do we shiver? Here are the answers to a few questions that have plagued mankind for centuries! We got these from Live Science .com.

• Blushing. You’ve been there. That certain someone walks into the room and smiles at you, your cheeks turn red and your whole face feels like it’s on fire! Turns out, this reaction is a universal human response to social attention. Common triggers include seeing your crush, meeting someone important and receiving a compliment. And ladies do it more than men. Blush biology works like this: the veins in your face dilate, causing more blood to flow into your cheeks – hence the rosy color. Still, even though we know HOW it happens, experts are stumped as to why - or what function it serves. That is, besides deflating your ego.
• Why do we have an Adam’s apple? Yes, that’s we. Contrary to popular belief, both men and women have Adam’s apples - a chunk of bony cartilage wrapped around the larynx. In men they just stick out a lot more because of our larger voice boxes - which is also the reason we speak in deeper tones. But does the Adam’s apple do anything? Not really. Like the cartilage in your ears or nose, it’s just there. But unfortunately, the Adam’s apple can betray men - at the office, during presidential debates, or while trying to talk their way out of a mistake with their wives. Why? Because it can “jump” uncontrollably when you're nervous.
• What exactly is the “funny bone”? Even a light tap to the back of your elbow can send pain shooting down your forearm. Well, turns out this spot isn’t a bone. You’ve actually hit your ulnar nerve, which controls feeling in your pinky and ring fingers and helps control the muscles in the wrist and hand. This nerve travels from your neck down your upper arm, wrapping around the elbow on its way to your hand. Usually it stays hidden within muscles and other tissue, but when it passes through your elbow joint, it’s very close to the skin - making it a vulnerable target. Some people think it got its silly name because the nerve also runs through the humerus bone in your upper arm.