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Limpieza de Sangre: Full-blooded Racism

Originating in 15th-century Spain, limpieza de sangre was a racist legal concept and a complex caste system developed as a way to discriminate between the Old Catholics and the newer Christian converts of known or presumed Jewish or Muslim heritage (conversos and Moriscos).


Clown fish laying in its sea anemone in Moorea, French Polynesia. (Photo: Shutterstock)

Do Fish Ever Get Any Shut-Eye?

Do fish sleep? Sleeping underwater poses some challenges, even for fish. To ensure they get enough oxygen and evade predators, fish have found unique ways to get the rest they need.