As the full moon rises this Wednesday evening, June 18, many people will be fooled into thinking it's unusually large. The moon illusion, as it's known, is a trick in our minds that makes the moon seem bigger when it's near the horizon. The effect is most pronounced at full moon. Many people swear it's real, suggesting that perhaps Earth's atmosphere magnifies the moon. But it really is all in our minds. The moon is not bigger at the horizon than when overhead. The illusion will be particularly noticeable at this "solstice moon," coming just two days before summer starts...