An curved arrow pointing right. Pen caps have a small hole to prevent choking if swallowed and to equalize the pressure inside the pen to keep it from leaking. Produced by Emma Fierberg.

An curved arrow pointing right. Pen caps have a small hole to prevent choking if swallowed and to equalize the pressure inside the pen to keep it from leaking. Produced by Emma Fierberg.

The pens and pencils that we write with are so important to our every day lives, we tend to forget how much history and thought there is behind them. Here are some fun facts about the things we ...