As a rough estimate, it would take 218 pounds of pressure to produce a tibial fracture in a healthy adult using a hammer.

Quoting a bike-helmet study published in the Journal of Neurosurgery: Pediatrics, he wrote that 235 kg (520 pounds) or 2,300 newtons of force would be needed to crush a human skull, almost twice as much force as human hands could possibly muster.

That depends on the bone. It is very easy to fracture a small bone, especially if the pressure is applied across the weakest point. I'm not sure exactly how much pressure is needed, but I can tell you that as little as 25 pounds of pressure applied to one of your small bones will cause a fracture.

A quick, sharp blow that delivers some 3,300 newtons of force has a 25 percent chance of cracking an average person's rib, she said. It takes more force to fracture the femur, Bir noted — maybe some 4,000 newtons — since that long thighbone is meant to support the body.

Ounce for ounce, bone is stronger than steel. One cubic inch of bone can withstand the weight of five standard pickup trucks, give or take a few pounds. If you're looking for the specifics to snap a piece of your skeleton, it takes about 4,000 newtons of force to break the typical human femur.

Dream interpretation folklore says to dream about your teeth crumbling and falling out indicates a feeling of powerlessness. There is something in your life you feel powerless to control or avoid. You teeth apparently represent your anxieties over decisions you have made.

To dream that your boyfriend or girlfriend is breaking up with you indicates that your relationship is moving to the next level. In a way, it is an end to something; you are leaving some past behind. At the same time, it is the start of something new or better. ... As a relationship evolves and grows, it also changes.

Dream interpretation folklore says to dream about your teeth crumbling and falling out indicates a feeling of powerlessness. There is something in your life you feel powerless to control or avoid. You teeth apparently represent your anxieties over decisions you have made. ... Dreams are amazing and mysterious experiences.