Các cặp vợ chồng đẹp đôi thường sinh con gái
Satoshi Kanazawa, nhà tâm lý học chuyên lĩnh vực tiến hóa, phát triển tự nhiên của loài người, đã đưa ra quan điểm rằng hình thức bên ngoài của người phụ nữ chính là thước đo đoán định khả năng sinh sản giới.
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