 Hello, and welcome to the How Small Is It? video book. This is a sequel to my first video book on how far away is it, where we started in my backyard and went all the way to the edge of the physical universe, explaining along the way how we knew how far away things were. In this video book, we'll start again from my backyard, but we'll move down to how small the smallest things can get. I've been motivated by two things to do this video. One is the success of how far away is it? Hundreds of thousands of hits over two million minutes watched. It's been very gratifying. The second is that in 1972 I studied quantum field theory for my master's degree at Oxford University, and recently the Higgs boson has been discovered. It's the boson for a field that was just beginning to be talked about back in the early 70s. So it's very exciting, but I noticed that the explanations are are so oversimplified that they're actually misleading. I heard one explanation and called the Higgs boson kind of a glue, molasses that slows things down. It's not anything like that, but it's not so mysterious that we can't understand it. So as we get down to how small things can get, we'll finish with the Higgs boson, what it is, the Higgs field, what it does, and the CERN Hadron Collider that finally found it. In our first chapter on the microscopic, we use microscopes and the wave duality, the wave particle duality for electrons to understand how an electron microscope works, and then use the electron microscope to see down to a carbon atom. In the second chapter, we'll go into the atom. We'll scatter alpha particles into the atom to find the nucleus. We'll cover the rules of quantum mechanics as we get deeper and deeper into the workings of an atom to help us understand how fields can have sizes. And it's set to stage for the Higgs boson. In the third chapter, we'll find a whole lot of new elementary particles, some of them not so elementary, a lot more than the electron, the photon, proton, and the neutron. They came from cosmic rays bombarding us from outer space. We'll also probe the proton, much like Rutherford scattering was used to probe the atom. We'll discover quarks on the inside of the proton and the neutron. And we'll lay the stage for the standard model. In the final chapter, we'll finish off the standard model by explaining force particles, bosons, the gluons for the quarks in the proton, the photon for the electromagnetic force, and then we'll get into the Higgs boson. Like we did with how far away is it? We'll explain along the way how we know how small things are. The pictures aren't as grand as the Hubble pictures of grand spiral galaxies, but I trust you'll find the story is interesting and informative. Thank you.