How to understand this phrase?
Hi, I saw the following phrase in a speech of Jeff Bezos, the founder of Amazon.com, 'solar cooker that didn't work very well out of an umbrella and aluminum foil', I think unbrella is used to keep out of sunlight, how could it be used to a solar cooker, or it is some kind of joke? Thanks.

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Answer

The umbrella is sort of close to the shape of a parabolic dish, which is what you need to have to focus the suns rays in a good solar cooker. The key words are "sort of". Since it is not a good parabola, it really doesnt work well.

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