Featured clue | 13-across: “Showoff ending in Connect Four”
Factoid | 27-across: “The aurora is caused by the Sun emitting electrically-charged particles called ions, which correspondingly move away from the Sun in a stream of plasma (ionized gas) known as the solar wind. As the plasma comes in contact with the Earth’s magnetic field, the ions will be agitated into moving around the Earth. Some of the ions become trapped and will consequently interact with the Earth’s ionosphere (an average of 60-80 miles above the surface), causing the ions to light up.”