Answer: According to the speaker, headlines about the benefits of chocolate and cheese came about when the scientist was doing studies with a drink that made people have less tryptophan in the brain.
This part of the thesis would be considered the topic, more specifically it would be considered the <em>introduction of the topic to study</em> since the thesis revolves around, I assume, Isaac Newton and you are offering a brief 'summary' of his life and accomplishments.
However if the reason to mention Sir Isaac Newton is to support an idea or a statement this could be considered a subtopic. It is subjective and directly related to the field of study you're doing the thesis for.
Hope this helps!
This is about “Harry Potter and the Sorcerer’s Stone”.
Harry Potter, an 11 year old boy, has no ordinary life. Even though his uncle and aunt disapprove and abuse him, making him utterly lonely, depressed and loathsome, he posses magical abilities far beyond their comprehension. One day, on Harry’s birthday, Rubeus Hagrid takes him away to Hogwarts, School of Witchcraft and Wizardry. While there, Harry meets his best friends, Hermione Granger and Ronald Weasley. They become suspicious of the potions teacher, Severus Snape, and believe he is up to most depraved activities. The trio begins to investigate his actions, and find loads of information about what they believe he is after and why. The pals believe the teacher is after the Sorcerer’s Stone, an object that can make the user immortal. When their suspicions prove incorrect about Professor Snape, they find that Professor Quirrell, Defence Against the Dark Arts teacher, has been helping Voldemort, the evil dark wizard that killed Harry’s parents and gave him his famous lighting bolt scar, to snatch the Stone. Harry, Hermione, and Ron knew what they must do. After a fearsome battle, Harry and his best friends are able to save Hogwarts from peril.