The Billy goat urinates all over his belly, chest, and beard to attract a mate. Similarly, a male porcupine sprays his urine in different directions—and when he finds a mate, he urinates all over her.

The sun is approximately 75% hydrogen, 25% helium by mass.

To "testify" was based on men in the Roman court swearing to a statement made by swearing on their testicles.

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