This is an encore repeat presentation of the science lecture held at the Wrangell-St. Elias National Park Visitor Center near Copper Center during the 2016 HAARP open house event hosted by the UAF Geophysical Institute. The High-frequency Active Auroral Research Program (HAARP) facility in Gakona, Alaska was developed in stages and operated from 1999 to 2014 through the U.S. Air Force, Navy, and Defense Advanced Research Projects Agency (DARPA). Ownership of HAARP infrastructure was formally transferred to UAF in 2015. HAARP consists of a powerful 3.6 megawatt net power phased-array HF transmitter (the ionosphere “heater”), capable of inducing localized perturbations in the ionosphere, and several diagnostic instruments that together comprise an aeronomy observatory. In this sense, the HAARP observatory is similar in many aspects to the Poker Flat Research Range. Popular media stories including HAARP are often partially or entirely based on wild conspiracy theories about secret government “illuminati” control of minds, weather, and earthquakes. This lecture is a layman overview of the arctic space environment that HAARP affects, fundamental concepts of radio science, and selected scientific results.