Yesterday afternoon I was playing outside in the snow with my five-year-old daughter when she asked, “why do we have winter?” She didn’t ask in a complaining way (she loves playing the snow), but in a genuinely curious way. My short answer was that where we live on Earth is tilted away from the sun for part of the year and that’s what makes it colder. She said, “okay, thanks Dad.” When she’s a little older I might show her the SciShow Kids and Crash Course Kids videos about seasons.