Ethan Jan earned three Guinness World Records titles for his extraordinary puzzle-solving and juggling abilities.

Carlos Mir, best known as "Cascading Carlos," began juggling at age 10 and now holds multiple Guinness World Record titles.

Unicycles and juggling were once the domain of clowns. Now, nerds rule both disciplines. Juggling world records, for example, are tracked by something called the Juggling Information Service Committee ...