In a chat with fans on the-leaky-cauldron.org, J. K. Rowling answered a fan's question of why Albus Dumbledore was sometimes able to see Harry under the Cloak of Invisibility, explaining that he used the Human-presence-revealing spell with non-verbal magic.
However it seems that Dumbledore eventually disclosed the cloak to Snape and possibly other teachers, as Snape knew Harry was in possession of the cloak in Prisoner of Azkaban, when Malfoy reported the apparent apparition of Harry's floating head outside the Shrieking Shack, which Snape immediately understood to be ...
At different points, Dumbledore possessed all three Deathly Hallows. He won the Elder Wand from Grindelwald, had the Invisibility Cloak in his possession when James Potter died, and wore the Resurrection Stone as it sat in Marvolo Gaunt's ring. Dumbledore's powers are really quite extraordinary!
The three Deathly Hallows – the Invisibility Cloak, the Resurrection Stone and the Elder Wand – have tempted many a wizard over the years.
Given to him so he could enter the house unseen. He was using it to make sure the Potters were alone, VMort would have him do just that.
Voldemort intentionally made six Horcruxes, but when he used Avada Kedavra on Harry, he unintentionally created a seventh Horcrux. Instead of dying, Lily's love for Harry created a counter 'curse' known as Sacrificial Protection and saved Harry.
These wizards can see invisible creatures. Sound familiar? Dumbledore knew Harry and Ron were under the invisibility cloak at Hagrid's hut in Harry Potter and the Chamber of Secrets, as his eyes flickered in their direction.
"Linfred was a vague and absent-minded fellow whose Muggle neighbours often called upon his medicinal services," Rowling explained. It was these "medicinal services," including "Skele-gro" and "Pepper Potion," that were the beginnings of the Potter family fortune.
Harry eventually comes to possess all three Hallows – the cloak being inherited from his father James Potter, later understood to be a descendant of one of the Peverell brothers, the Resurrection Stone in the Golden Snitch bequeathed to him by Dumbledore, and the allegiance and mastery of the Elder Wand when he defeats ...
Only one Invisibility Cloak, the third of the three Hallows, and supposedly the Cloak of Death himself, does not suffer the ravages of time, and cannot be damaged by magic. Harry, Ron, and Hermione are uncomfortably aware at this point that the Cloak in Harry's possession matches this description perfectly.
"Dumbledore fell in love with Grindelwald" and was "blinded" by it. "This was Dumbledore's tragedy."
Gaunt's ring
After retrieving the ring Albus Dumbledore himself fell victim to a curse that, even when contained, would likely have killed him within the year. Once rendered defunct as a Horcrux, the stone was placed inside a Golden Snitch and left to Harry Potter in Dumbledore's will.
Following Dumbledore's death, Fawkes sang his Lament over the grounds of Hogwarts School of Witchcraft and Wizardry, and then left, never to be seen again. His tail feathers were the cores of the two twin wands which were held by Lord Voldemort and Harry Potter.
Harry's scar had hurt during Arrival Feast because of Quirrell's connection to Voldemort; Snape was then talking to Quirrell, allowing Voldemort, from the back of Quirrell's head, to sense Harry's presence.
Severus Snape is one of the most divisive characters in the entire "Harry Potter" series. He was a double agent, so many character details were kept a secret. His mother was a witch and his father was a Muggle, leading to the moniker "The Half-Blood Prince."
Lord Voldemort was unaware that this Horcrux had been destroyed, until he forced the truth out of Lucius Malfoy (who did not know the diary was a Horcrux) shortly after his return to power in June of 1995, due to the portion of the soul being separated from his body for such a long time.
After some reflection, Harry understands that the Stone would not help him after some reflection. But the fact remains that his initial choice is the Stone, showing that he is largely focused on death.
Harry didn't want Voldemort getting the Stone
He truly thought that there was no way out for him and he didn't want Voldemort or his evil cronies to get their hands on the stone. So he hid it the best way he could in the short time he had: by dropping it amidst similar-looking ordinary stones.
The symbolic value of the Master of Death
Once again, this wisdom comes from Dumbledore and it is imparted to us in Deathly Hallows: Harry is the true Master of Death because he accepts death as being part of life, something that cannot be escaped.
This idea was incredibly embarrassing to him since Ron vehemently did not want to be cared for by his rich and famous best friend. This is precisely why Harry never tried to give the Weasleys money or give Ron lavish gifts - they didn't want pity.
And this is why Hermione does not fit into Ravenclaw, since she lacks their creativity of thought. When you also add in her fearlessness and her strong convictions about right and wrong, which are inherently Gryffindor traits, then there was even less of a chance she'd end up wearing blue and bronze.
In the movie, professor Minerva McGonagall gives Harry Potter a Nimbus 2000 when he joins the Gryffindor Quidditch team.
In Rowling's Harry Potter series, Dumbledore demonstrated the ability to possess wandless magic on several occasions, most memorably when he cast Aresto Momentum without a wand to save Harry from falling to his death during a Quidditch match.
As J.K Rowling revealed, Albus Dumbledore had mastered Parseltongue too – although he could not speak it aloud.