One interesting theory on the cause of manic depression or bipolar disorder is that there is a super-fast biological clock located in the hypothalamus, in the center of the brain, which is actually a tiny cluster of nerves called the supra chiasmatic nucleus or SCN.
Since the release of the first novel, Harry Potter and the Philosopher's Stone, on 26 June 1997, the books have found immense popularity, critical acclaim and commercial success worldwide.
The Hobbit is the first novel by J.R.R. Tolkien set in Middle-earth. The book was first published on September 21, 1937 and is set in the years 2941 to 2942 of the Third Age before the events of The Lord of the Rings.