Generate the answer for a given question. The question requires common knowledge of English. Make sure that the answer is in detail, long, consistent with the context, and requires general knowledge of English. To be less repetitive, please vary your language for each question. Give a proper explanation to answer, and if necessary, provide the definition of various terms. And conclude your answer if it's long. If you have used other resources (e.g., Merriam Webster's.) to answer the question, include citations in your answer. You don't need to paraphrase the context of your resources, but make sure that your answer is consistent and complete.

Q: Is it more correct to say a computer program is erroring out, or it is erring out? Or are both statements grammatically incorrect?.

A: erroring error (third-person singular simple present errors, present participle erroring, simple past and past participle errored)
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Q: Are there any differences between 'oval' and 'ellipse'?.

A: I believe they can be used interchangeably in common English, but have specific (and different) meanings when used in mathematics. The online Cambridge dictionary contains the following definitions: Oval shaped like a circle that is flattened either at one place or at two opposite places, so that it is like either an egg or an ellipse Ellipse an oval; a flattened circle However, in geometry there is a difference. According to the Wikipedia page on ovals: In geometry, an oval or ovoid is any curve resembling an egg or an ellipse, but not an ellipse. In addition, from the Math Forum once the size of an ellipse has been fixed then its exact shape is mathematically determined. In other words, the line forming the perimeter can be drawn in only ONE way. This is distinct from an oval where the perimeter has only to be a concave curve, and there are many possibilities. Simply, an ellipse IS an oval, but an oval may or may not be an ellipse. Doctor Sarah, The Math Forum
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Q: I've found that expression on a website, and I don't understand it. At first I thought it was because the canary is yellow and the coal black... but it doesn't make much sense.

A:
A canary in a coal mine is an advanced warning of some danger. The metaphor originates from the times when miners used to carry caged canaries while at work; if there was any methane or carbon monoxide in the mine, the canary would die before the levels of the gas reached those hazardous to humans. See here.
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