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Guess What? Fish Can Do Basic Math!

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University of Bonn researchers taught fish to do basic math (Credit: Dr. Vera Schlüssel/University of Bonn)

Your silent, expressionless pet goldfish may appear oblivious to you and its surroundings. But the aquatic vertebrates are smarter than they seem. Previous studies have shown that fish are quick learners, can retain information for up to five months, and even recognize their owner from a group of humans.