Updated: Author reveals new info about Snape and his potions.

J.K. Rowling has posted the third of 12 new Harry Potter "moments" on her website, Pottermore.

In the 12 days leading up to Christmas Eve, new Harry Potter content will be released daily on the site. The site's official blog said:

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We're feeling extra generous this year, so we're bringing you early gifts this Christmas. Starting Friday, December 12, we'll be releasing a festive surprise for you every day at 1pm GMT (8am EST).

With wonderful writing by J.K. Rowling in Moments from Half-Blood Prince, shiny gold Galleons and even a new potion or two, make sure you don't miss out – just visit pottermore.com and answer our rhyming riddles to unwrap a #PottermoreChristmas surprise every day.

Update: Here's the third riddle.

Any guesses?

Pottermore

Chemistry was my least favourite subject at school, and I gave it up as soon as I could. Naturally when I was trying to decide which subject Harry's arch-enemy, Severus Snape, should teach, it had to be the wizarding equivalent. This makes it all the stranger that I found Snape's introduction to his subject quite compelling ('I can teach you to beetle fame, brew glory, even stopper death…'), apparently part of me found Potions quite as interesting as Snape did; and indeed I enjoyed creating potions in the books, and researching ingredients for them.

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