Once you've recovered from Breaking Bad's return to the airwaves last night, you may take some time to reflect on some of the show's finer points — such as whether the scientific scenarios depicted within could really happen as they do on the screen.

Fortunately, GigaOm has at least some of the answers, enlisting the show's science advisor, chemistry professor Donna Nelson, and other university figures to weigh in with their thoughts. Read the full article to find out more about the role of hydrofluoric acid in the infamous bathtub scene, along with the answer to the age-old question: "Why is Heisenberg's meth sky blue?"