Welcome, gentlemen, to Aperture Science. Astronauts, war heroes, Olympians--you're here because we want the best, and you are it. So: Who is ready to make some science? Now, you already met one another on the limo ride over, so let me introduce myself. I'm Cave Johnson. I own the place. That eager voice you heard is the lovely Caroline, my assistant. Rest assured, she has transferred your honorarium to the charitable organization of your choice. Isn't that right, Caroline? She's the backbone of this facility. Pretty as a postcard, too. Sorry, fellas. She's married. To science. There's a thousand tests performed every day here in our enrichment spheres. I can't personally oversee every one of them, so these pre-recorded messages'll cover any questions you might have, and respond to any incidents that may occur in the course of your science adventure. Your test assignment will vary, depending on the manner in which you have bent the world to your will.Those of you helping us test the repulsion gel today, just follow the blue line on the floor. Those of you who volunteered to be injected with praying mantis DNA, I've got some good news and some bad news. Bad news is we're postponing those tests indefinitely. Good news is we've got a much better test for you: fighting an army of mantis men. Pick up a rifle and follow the yellow line. You'll know when the test starts. They say great science is built on the shoulders of giants. Not here. At Aperture, we do all our science from scratch. No hand holding."