Anyway, a quick look at the guy's leg confirms that he's human after all, but his calf muscles are extremely atrophied. Makes sense in that you don't use muscles when you float: just ask astronauts. But Walter points out that for deterioration like he's got, he would have had to be weightless for some time. Also, points out Peter, the chest and shoulders are all normal.

Olivia strolls over to ask if they know anything about osmium, instead of Googling it on her magic phone like anyone else would have. If she had done that, though, we wouldn't have been treated to Peter showing off how quickly he can rattle off some information about how it's a durable metal used in electrical contacts and fountain pen nibs. Really, fountain pen nibs? Olivia says the warehouse is missing a substantial quantity, so she thinks that's what the thieves were after. Peter says that's weird because osmium isn't particularly valuable, but Walter points out the irony of the crime: osmium is the heaviest element on Earth: "It's like using balloons to steal bowling balls," he says.

Over at Frost Aerodymanics, guest star Alan Ruck is talking to a co-worker about how something would require the cockpit be resistant to radiation at higher altitudes, so maybe they should blend it with a slightly denser compound.

The other guy from the robbery is in the car park as Ruck and his co-worker enter, and he calls for Dr. Krick, and a surprised Ruck asks "Scotty" to give him a minute, and goes over to ask what the hell the guy's doing here. "Koenig is dead. There was a guard. He shot him," he says, and Krick is a little nonplussed to find out that Koenig's body was left behind. "I had to. What do we do?" says the accomplice, and Krick tells him to go home while he figures something out. But there's more: "I've been nauseous. And my head is killing me. I didn't feel like this the last time," he says, and Krick asks if they got what he asked for. Buddy nods and starts to get it, and Krick tells him not here, ordering him to go to the lab and wait for him. Krick then goes back to his co-worker, and I can only imagine the story he told to explain why some guy who looks like he's in heroin withdrawal just accosted him in a parking lot. Buddy gets back into the car, pulling -- with difficulty -- his weighted-boot-wearing legs inside the vehicle.

Over in Walter's lab, Peter's going through Bell's old files, looking for anything related to gravity. I won't gross you out with Walter's speculation as to what a file labeled "floaters" might actually contain, but when Astrid reacts with disgust, Walter says, "Everybody poops, dear," which is true. Doesn't exactly make it a fun topic of conversation, though. There's another file, too: Personal floatation devices. Peter starts reading it: "The balloon is to be swallowed and then inflated with helium via a tube inserted into the subject's..." Thankfully, Peter stops reading, and Walter reflects on the design flaw that prevented a ton of people for volunteering. Can we be done with the zany scientist comic-relief portion of the show now?