You've heard these questions. If a business is opened twenty-four hours, why do they have locks on their doors? Why is braille used on drive up ATMs? Thanks to Uncle John's Bathroom Reader, which I read in my living room, I found the answer. Number one, locks on doors. It is less expensive to make all doors with locks than to make some without. Same thing with braille. The blind use walk up ATMs. It's cheaper to make all ATMs with braille then to make a some without. Now that the mystery is solved you can sleep at night. You're welcome.
