WAVECEL 'EGG EFFECT': To illustrate the basic mechanism of brain injury, WaveCel constructed a see-through head model and filled it with translucent gel that has a similar density as a human brain. They then suspended two raw egg yolks in the brain gel to visualize brain distortion during an impact.
NPR
Next gen hard hats give better protection against head injury
How a new hard hat technology can protect workers better from concussion
"Traumatic Brain Injury is an occupational hazard that the construction industry sees more than any other industry in the U.S., and the hard hat is the first line of defense."