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.
1 The book series and film series were released over a ten year period. 2  The Philosopher's Stone was first published in the UK in 1997, with the final book The Deathly Hallows published in 2007. The book series and film series were released over a ten year period. 2  The Philosopher's Stone was first published in the UK in 1997, with the final book The Deathly Hallows published in 2007.