When I worked at Apple, it was fun to walk in some buildings and notice the California 'cancer warning' sign posted in the lobby. From that, you knew there was probably a hardware engineering lab somewhere in that building, because I believe they had to post those due to carcinogens released from soldering. (And, inside of Apple, that kind of knowledge would only be shared on a need-to-know basis, otherwise.)
zaroth|8 years ago
It’s impossible to construct a building which would not contain some element which would trigger the legal requirement of posting the sign.
The sign conveys you absolutely no information. Look closer and you will see they are posted on every commercial building run by someone smart enough to know to post them. The more entertaining places I’ve seen them is grocery stores and preschools.