Misc: What is the only part of the human body that cannot repair itself?

Questions

In 121 Marcus ---------- 16th Roman emperor (161-80), philosopher, born. ?

In 295 8th recorded ---------- passage of Halley's Comet ?

In 1314 Clement V pope (1305-14) who moved papacy to ---------- , dies ?

In 1770 Capt ---------- arrives in New South Wales ?

In 1792 France declares war on ---------- , Prussia & Sardinia ?