A couple days ago I asked the question "If there was a clock that halves it's speed every 12 hours, when would it reach midnight?". This spurred a long discussion about different ways to interpret the problem and a variety of answers. Which brings to my attention that there are several people here who, like me, are interested in mathematics discussions so I decided to create a topic for this. Let's talk about interesting math problems and solutions! I'll start us off by asking, what do you think the sum of natural numbers (1, 2, 3, etc) is equal to? -1/12?