The University of Texas has a truck that's built to shake the ground under it. It's officially the Large Mobile Shaker, but they call it the T-Rex, because its effects may remind you of the earth-shaking footsteps of the T-rex in Jurassic Park. That's cool, but why would you want to shake the ground? It's for research and testing. The research is on what parts of the country could be subject to what kind of damage in an earthquake, and the testing is for projects like construction, in case there are soft spots and flaws underneath. Tom Scott talks to Professor Ken Stokoe about they way they use the Large Mobile Shaker. Read more about the truck here.