When you get into the very small scale into the quantum world and you have a quantum particle pushing on a barrier, there's a finite probability that that particle can actually pass through the barrier and that process is called quantum tunneling. What we've done in our experiment is look at the most basic atom, the most simple atom, and look how long it took an electron to pass through that barrier. So the only atom we can model precisely is the hydrogen atom. The major advantage of our experiment is to do this experiment with hydrogen atoms. There are no electron correlations. When they measure the electron anvil, we can calculate the anvil precisely in compare the theory of the experiment. We created what's called elliptically polarized light, and that means the electric field of the light points in a particular direction. The light that we use is very short. It has a pulse duration of 5.50 seconds, which is 2 oscillations electric field at 800 nanometers. We can actually make that pulse of light behave like a clock by doing this particular polarization. We can have well-defined reference points when we start the interaction with the atom, when we expect an electron to come out, and when do we actually see it come out. Any difference between that tells us something about this tunneling time. We determine that time must be less than 1.8 atticecond. And an atticecond is a billionth of a billionth of a second. The work is very important because it resolves very long-standing and very controversial problem in quantum physics about the tunneling time. People have been arguing about it since early days of quantum mechanics since 1930s. And our work rules out a whole range of theories for times greater than what we actually measure. So we have an excellent research team, Martin Tian Griffith, which included people of all levels, faculty members, as my self-interrobered PhD student, who was actually first author of this paper. It's a remarkable opportunity for her to be enrolled in this type of research, which results ultimately in the publication of the most important scientific journal in the world.