During the commercial break, Kumar did a "full-body bone scan" on Maggie, looking for hot spots where her bone was hard and drill-proof. The scans came back showing no hot spots at all, which Agnes and Taub chalk up to Kumar screwing up the test, since they're mad at him for giving House a present. Foreman figures out that the reason Maggie's bones look consistently dense is that they are -- all of her bones are hard and drill-proof. What is she, Wolverine? That sounds so cool, but the reality of stone bones is that you die. So it's not so great. In fact, House says, Maggie probably won't live to see Kwanzaa. At this, the camera cuts to Foreman rolling his eyes. Be a little subtle, camera. Come on. This is like when we studied slavery in my history class and everyone kept staring at the one black girl. The one Indian girl in the class, meanwhile, probably sat there thanking her lucky stars that our school's refusal to learn about other countries and their histories spared her from the same incredibly uncomfortable situation. Unfortunately for her, she was wrong, because then my school had International Day, in which all the students who looked different were made to stand up in front of the school and give presentations on their "home country" even though all of them were born in America and so were most of their parents. Kumar says that Maggie must have Carbonic Anhydrase Type II deficiency, since that's the only cause of osteopetrosis that can be treated. House tells them to test Maggie for CA2 and cross their fingers.