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One of the most important predictions of Einstein's theory of General Relativity is the existence of black holes.
The rotating black hole has been described as one of nature's most perfect objects.
Word of the Day
- A person who stands up for something, as contrasted to a bystander who remains inactive.
- One of the upright handlebars on a traditional Inuit sled.
The word 'upstander' in the first sense here is a play on the word 'bystander' and the idea of 'standing up' for something.