ballpoint pen

Indian student creates world's smallest vacuum cleaner
An Indian student has set a Guinness World Record by turning a ballpoint pen into the world's smallest vacuum cleaner.
The truth behind NASA spending money on pen research in the universe
It turns out that the story you have heard for so long is just a trick. The real story is hundreds of times more interesting!
Use of small holes in ballpoint caps
The small hole at the end of the ballpoint pen is designed to be safe for the user, but its true effect is still controversial.
For the first time in history, China has produced its own ballpoint pen
For China, this is one
The truth is like joking about the great 'inventions' in history
Do you know who invented things