|Note the red tassel. 'Raptors despise red tassels, true fact.|
Do you know how many casualties per year there are, due to people getting sucked into space-time warps and having no arms to defend themselves against the lizard-men of dimension X? Or dinosaurs? Do you?
Didn't think so. You'll thank me when all that stands between you and a pack of hungry 'raptors is your trusty lab-spear. Here is a close-up of the safety-sign I made - you are welcome to use it in your own lab. Just don't forget to replace the safety spear if one of your colleagues has been sucked into the warp.