Chapter 26: Cosmology Why is the sky dark? The expanding universe Beginning of the universe: The Big Bang Cosmic microwave background The early universe.
鱼鳞癣患者 іхтіоз سماك ichtyóza קשקשת ictiosis ихтиоз イクスィオウスィス ichtyose iktiyozis Ichthyosis is a common skin disorder passed down through