CBD has been shown to suppress colon cancer tumors in mice and to kill breast cancer cells in lab studies by Dr. Sean McAllister at the California Pacific Medical Center. However, cancer specialists caution that the efficacy of CBD for cancer remains to be demonstrated in actual human studies.
The Tumbler. Each file cabinet lock has a tumbler just like a door lock. This tumbler works in the same way. When the key is inserted into the file cabinet lock, the teeth push and roll the tumblers into position, based on the shape of the key.
To understand how master keys work, you first have to have a basic idea of how locks and keys work. Inside a cylinder lock, there is a sort of puzzle, which only the correct key can solve. The main variation in lock designs is the nature of this puzzle. One of the most common puzzles is the pin-and-tumbler design.