8 Scientific Theories That Totally Change Captain America: Civil War

7. Captain America's Shield

As well as his stunning physical abilities, part of the Cap's whole thang is his seemingly impossible shield.

This remarkable disk of red, white and blue can seemingly absorb enormous impacts without shattering or transferring any energy to the captain himself. It can also ricochet almost endlessly before returning to its owner. As our shiny new Spiderman pointed out, that thing doesn't seem to obey any of the laws of physics.

There are, however, a couple of theories floating around out there that attempt to rationalise the amazing shield.

The first law of thermodynamics states that energy cannot be created or destroyed, only transferred. In order for the good captain's shield to prevent him from being thrown bodily across the street whenever he blocks an enemy's blow, the shield must be somehow converting the energy.

Made from the fictional substance vibranium, it could be that the shield acts as a capacitor. It could have a molecular structure that is able to not only absorb the kinetic energy from and impact, but store it and release it again to enable it to fly about with such speed and force.