1. Cats love cardboard boxes because they relieve stress. Studies show that hiding inside small, enclosed boxes lowers a cat's stress levels. The cardboard walls provide a cozy spot where they feel safe from predators and traps body heat to keep them warm!

2. The cardboard box was inducted into the National Toy Hall of Fame. In 2005, the simple cardboard box was officially named one of the greatest toys in history alongside Lego and the Slinky! Judges chose it because a child's imagination can transform a plain box into a spaceship, a castle, a race car, or a fort.

3. Cereal boxes were originally sold as a healthy health food. When John Harvey Kellogg and his brother Will created corn flakes in 1894, they packaged them in cardboard boxes with wax paper liners to keep the food fresh, launching the modern breakfast cereal industry!

4. Pizza boxes have special venting tabs to stop soggy crusts. Modern corrugated pizza boxes feature small, punch-out steam vents in the cardboard lid. These tiny holes allow hot steam to escape so moisture doesn't trap inside and turn the crispy pizza crust into mush!

5. Over 90% of all products shipped in North America arrive in cardboard boxes. Cardboard is the most popular packaging material on the planet. Even better, cardboard boxes can be recycled up to seven times before their paper fibers become too short to make new paperboard!

6. Interlocking shipping containers revolutionized global trade. Modern metal shipping boxes (the big steel containers on cargo ships) were standardized by Malcolm McLean in 1956. Because every container is built with identical corners, cranes can quickly stack them like gigantic Lego bricks onto ships, trains, and trucks.

7. Corrugated cardboard boxes use a clever wavy arch design. The secret to a cardboard box's strength is its middle layer, which is shaped into S-shaped flutes or arches. These miniature arches act like tiny bridges, distributing heavy loads so a lightweight paper box can hold heavy objects without collapsing!