1Potions, plot, personalities: understand how science progresses and why scientists sometimes disagree

In the sixth Harry Potter book, Harry Potter and the Half-Blood Prince, Harry developed a flair for making potions by following instructions handwritten in the margins of his potions textbook by the book’s previous owner. To make a Draught of Living Death, for instance, the handwritten notes in Harry’s book advised him to stir his potion clockwise after seven stirs in the opposite direction. The tiny tweak in the procedure helped Harry achieve potion perfection. Meanwhile, Harry’s brilliant friend, Hermione, who carefully followed the original textbook instructions line by line, became frustrated when she could not get her potions ...

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