Quirrell was able to shake Harry's hand because at that time, he was not yet possessed by Voldemort. It was only later in the story that Voldemort's spirit took possession of Quirrell's body, allowing him to shake Harry's hand without being harmed. This was a crucial plot point in the story, as it foreshadowed the eventual reveal of Quirrell's true allegiance and the presence of Voldemort. **

I would like to know more about Professor Quirrell's motivations and background. What led him to become involved with dark magic and ultimately serve Voldemort? Additionally, I am curious about his relationship with Voldemort and how he was able to keep his true allegiance hidden from the rest of the wizarding world for so long. Finally, I would like to understand more about the extent of his powers and abilities, as well as any weaknesses or vulnerabilities he may have. **

Yes, in the first Harry Potter book, Professor Quirrell does touch Harry without burning. This is because at that point in the story, Quirrell is not yet possessed by Voldemort, and therefore does not have the same aversion to touching Harry. It is only later in the story, when Quirrell is fully possessed by Voldemort, that he is unable to touch Harry without experiencing pain. **

Before Professor Quirrell, the Defense Against the Dark Arts teacher at Hogwarts was Professor Gilderoy Lockhart. Lockhart was known for his charming personality and his supposed heroic deeds, although it was later revealed that he was a fraud who had been stealing credit for other wizards' accomplishments. He taught at Hogwarts during Harry Potter's second year. **

In the Harry Potter series, it is established that Harry's scar hurts when he is in close proximity to Voldemort or when Voldemort is experiencing strong emotions. At the time Harry first meets Professor Quirrell in Diagon Alley, Voldemort is still weak and attached to the back of Quirrell's head, and not fully revived. Therefore, it is possible that Harry did not feel his scar hurting at that moment because Voldemort's presence was not strong enough to trigger the pain. Additionally, Harry was not aware of the connection between his scar and Voldemort at that point in the story, so he may not have recognized the significance of the lack of pain. **

The valves on heating pipes are typically ball valves or gate valves. Ball valves have a spherical disc inside that controls the flow of water by rotating the handle, while gate valves have a gate or wedge that moves up and down to control the flow. Both types of valves are used to regulate the flow of hot water through the heating system and can be manually operated to adjust the temperature or shut off the flow completely. **

Yes, the consumption of energy-saving pumps may increase when replacing heating pipes. This is because energy-saving pumps are designed to operate more efficiently and effectively with newer heating systems and pipes. The improved performance of the energy-saving pumps may lead to increased usage, as they are able to distribute heat more evenly and effectively throughout the system. Additionally, the replacement of old pipes with newer, more efficient ones may also contribute to increased energy consumption, as the system may be able to operate more efficiently overall. **

Some recommended mixers for cocktails include soda water, tonic water, ginger beer, and fruit juices such as orange, cranberry, and pineapple. These mixers can be used to create a wide variety of classic and modern cocktails, and can be easily combined with various spirits to create refreshing and flavorful drinks. Additionally, simple syrup and bitters are also commonly used as mixers to add sweetness and depth of flavor to cocktails. **