The meat can be packaged with carbon monoxide gas to retain the red hue and look fresher . It displaces the oxygen that would normally oxidize the meat and turn it brown . They do the same thing with potato chip bags but use nitrogen in that case . <| sep |> I am thinking you meant Definitely snipe if it ' s the First Light again . <| sep |> Title CellsTitletext Now , if it selectively kills cancer cells in a petri dish , you can be sure it ' s at least a great breakthrough for everyone suffering from petri dish cancer . Comic ExplanationStats This comic has been referenced 801 times , representing 0 . 5854 % of referenced xkcds . x k c dtranscribersubjectignore % 20 memessageignore % 20 me x k c d t r a n s c r i b e r s ubjectdeletemessagedelete % 20 t 1 dadg 1 wu