A South Korean mathematician has solved a geometry puzzle that baffled experts in the field for nearly six decades.

Explore the "25 Most Famous Unsolved Mysteries" in this intriguing video. WATCH OUR OTHER VIDEOS: ►25 Mysterious Real Life Video That Can’t Be Explained <a href=" ►25 Mysteries That Are Still Unsolved ...

Number enthusiasts may be looking to the new year with a touch of melancholy. Another perfect square like 2025 (45 2 = 2,025) ...