How to get pregnant: Video shows why some sperm will never fertilise an egg - Gold Coast Bulletin

1. How to get pregnant: Video shows why some sperm will never fertilise an egg  Gold Coast Bulletin
2. Female bodies block slow sperm, research finds  New York Post
3. Weakest sperm left behind at 'gates' along reproductive path, study finds  CNN
4. Study suggests female reproductive tract may have evolved to favor faster swimming sperm  Phys.org
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