Franklin's inventions included a flexible catheter.
The previous method, a rigid metal catheter, was not pleasant, so he devised a flexible one made of hinged tubes.
Franklin also studied ocean currents and the causes of common colds.
These inventions help us see at a distance and for reading.
A lightning rod was another invention that Benjamin Franklin made. It is a device that takes an electrical charge and transmits it to the ground safely.
This invention was inspired by an experiment that Franklin carried out in 1752. He flew a kite with a key on it and was amazed that the key would actually lead the electricity to the ground.
Afterwards, Franklin wondered if a lightning rod could keep buildings safe from lightning strikes.