Classical immunology ties in with the fields of epidemiology and medicine. It studies the relationship between the body systems, pathogens, and immunity. The earliest written mention of immunity can be traced back to the plague of Athens in 430 BCE. Thucydides noted that people who had recovered from a previous bout of the disease could nurse the sick without contracting the illness a second time. Many other ancient societies have references to this phenomenon, but it was not until the 19th and 20th centuries before the concept developed into scientific theory.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): When did immunology start to become codified as a scientific theory?
Ah, so.. 19th and 20th centuries

The Nea Moni Monastery on Chios was established by Constantine Monomachos in 10431056. The exceptional mosaic decoration of the dome showing probably the nine orders of the angels was destroyed in 1822 but other panels survived (Theotokos with raised hands, four evangelists with seraphim, scenes from Christ's life and an interesting Anastasis where King Salomon bears resemblance to Constantine Monomachos). In comparison with Osios Loukas Nea Moni mosaics contain more figures, detail, landscape and setting.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): When was the mosaic at the Nea Moni Monastery destroyed?
Ah, so.. 1822

Spielberg's films often deal with several recurring themes. Most of his films deal with ordinary characters searching for or coming in contact with extraordinary beings or finding themselves in extraordinary circumstances. In an AFI interview in August 2000 Spielberg commented on his interest in the possibility of extra terrestrial life and how it has influenced some of his films. Spielberg described himself as feeling like an alien during childhood, and his interest came from his father, a science fiction fan, and his opinion that aliens would not travel light years for conquest, but instead curiosity and sharing of knowledge.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Why does Spielberg think aliens would visit?
Ah, so..
curiosity and sharing of knowledge