Ron Weasley attempted a fake spell that his brothers gave him:
"Sunshine daises, butter mellow, turn this stupid fat rat yellow!"
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He didn't exactly spare him; he tried to kill him but failed.
She failed her mission to attempt to become the youngest person to sail solo around the world, nonstop. But she vowed to sail again and accomplish her dream or crossing the globe. Now that perseverance!
It is a scar in the shape of a lightning bolt. The scar was caused when Lord Voldemort tried to kill him, when the curse failed it left that scar. The scar and the failed curse connect Harry to the Dark Lord.
Deidara died in an epic clash with Sasuke. After he tried his best jutsu, and failed, he used his last trump card, an explosion, but Sasuke used Orochimaru's summoned snake, Manda to use a shield.
Ron Weasley's Great Aunt Muriel says in Harry Potter and the Deathly Hallows that most squibs went to muggle schools and tried to live in the muggle world, as it would be far to harsh to have them live in wizarding world, where they would always be second class.