I briefly described the scientific method, explaining the cycle of hypothesis - setting up an experiment to test the hypothesis - tweaking the hypothesis - setting up a new experiment to test the tweaked hypothesis - etc. Of course, in astronomy one cannot control the experiment, so we rely on observations using multiple tools (optical telescopes, X-ray satellites, etc). In this lesson we started to cover the basics of the electromagnetic spectrum, and Jared very quickly understood that radio waves and X-rays are extensions of the visible spectrum that we are all familiar with. We covered frequency, wavelength, amplitude, and the energy carried by waves.