![Why are pencils yellow? Why do pen caps have holes? These and other wacky facts about writing instruments - YP | South China Morning Post Why are pencils yellow? Why do pen caps have holes? These and other wacky facts about writing instruments - YP | South China Morning Post](https://cdn.i-scmp.com/sites/default/files/styles/portrait/public/d8/yp/images/750148f6-7de6-11e9-8126-9d0e63452fe9imagehires110911.jpg?itok=o-Pecwtt)
Why are pencils yellow? Why do pen caps have holes? These and other wacky facts about writing instruments - YP | South China Morning Post
Is that little hole in the end of BIC pen caps really so that it can be used in a cricothyrotomy, or is it just so water doesn't stay in the cap
![Why are pencils yellow? Why do pen caps have holes? These and other wacky facts about writing instruments - YP | South China Morning Post Why are pencils yellow? Why do pen caps have holes? These and other wacky facts about writing instruments - YP | South China Morning Post](https://cdn.i-scmp.com/sites/default/files/styles/landscape/public/d8/yp/images/750148f6-7de6-11e9-8126-9d0e63452fe9imagehires110911.jpg?itok=YzJT1ZoV)