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Is Spring Fever Real? - Instant Egghead #68

Key Facts In This Video

  1. A study found that men produce the most (and healthiest) sperm in early spring. 00:23

  2. Scientists believe our seasonal change in melatonin (the "sleep hormone") may explain why we're more active in spring. 00:32

  3. The closer to the equator, the less evidence exists of spring fever. 01:20