user: What is the plot of Harry Potter?

assistant: The books concern a wizard called Harry Potter and his journey through Hogwarts School of Witchcraft and Wizardry. The stories tell of him overcoming dangerous obstacles to defeat the Dark Wizard Lord Voldemort, who killed his parents when Harry was 15 months old.

user: Provide a bulleted list of the different shapes of lenses

assistant: The following are the different shapes of lenses:
- Convex: Curves out from the middle of the lens
- Concave: Curves into the middle of the lens
- Planar: Flat lens

user: Why is selling stocks short a high risk investment technique

assistant: Short selling stocks is a high risk technique as you are betting that a stock will go down in value and the downside risk is essentially unlimited.  When you buy a stock "long" you know the stock can "only" go to (0) so your risk is what you invested, when you are selling a stock "short" the stock has no limit to far it can go up and therefore how much money you can lose.