When Tesla revealed that the Model X (and eventually, the Model S) would have a HEPA filter so effective that it could protect against bioweapons, people were understandably skeptical. Can it really save you from terrorists? Apparently, it just might. Tesla has revealed some of the in-house testing it conducted for the filter's Bioweapon Defense Mode, and its ability to clean the air borders on overkill. The electric car maker put a Model X into a bubble with extremely dangerous air quality levels (83 times dirtier than the EPA's "good" rating) and watched as the filtration system rendered the air so clean that sensors couldn't even detect what pollution was left. You could drive through a "military grade" attack and not even notice, Tesla claims.