Here's a breakdown:

* Particle accelerators: These are giant machines that use electric and magnetic fields to accelerate charged particles (like protons or electrons) to extremely high speeds.

* Smashing: When these accelerated particles collide with a target (often other particles or atoms), the energy of the collisions is so great that it can break apart the particles, revealing their internal structure and creating new particles.

* Why they do it: This process allows scientists to study the fundamental building blocks of matter and the forces that govern them.

Famous examples of particle accelerators:

* Large Hadron Collider (LHC): Located at CERN in Switzerland, it's the world's largest and most powerful particle accelerator. It was used to discover the Higgs boson, a fundamental particle that gives mass to other particles.

* Stanford Linear Accelerator Center (SLAC): Located in California, it's a linear accelerator that was used to discover the first evidence for quarks, the fundamental building blocks of protons and neutrons.

Let me know if you'd like to learn more about a specific particle accelerator or the research that is being conducted with them!