Fire Grenade
This person required the help of all the scientific experts on Reddit to figure out the purpose of this next item, that has apparently been lying around in his lab for years. Can you imagine having something lying around your house, your office, or your lab for years and having absolutely no idea what that thing is? Now, thanks to Reddit, they finally have an answer.
While it looks like some kind of a lightbulb or a salt shaker, this person was informed it was an old fire grenade. The purpose of this fire grenade isn’t to light up a fire, but to put one out. In the event of a fire, you’re supposed to throw one of these things into the flames. However, this object seems pretty old, and it has been lying around the lab for years, so I wouldn’t count on it to do the job.