It was believed that women were the responsible of giving birth of male or female children. The medical science has discovered that, female is not responsible for the sex determination of fetus, but male is the solely responsible for that. The sages of yore had this knowledge even thousands year ago. This science has been embedded in Aitareya Upnishad (2:1) – In the self only one bears the self. By shedding it into a female, he gives birth to it. It is a clearly indication that the male semen decides the sex of the fetus. It is wrong to blame soil for the crops, the crops depends on the seed we put into the soil. According to one medical research- fetus can hear and recognize the voice in the womb. The same has been experimented with some particular music with the fetus in the womb. And the same music got played after the birth of the fetus. Fetus reacted on the particular music which he had heard in the womb. Many people had scorned about the mythological idea of hearing and learning the archery skill in the womb of mother by Abhimanyu in Mahabharata. The above research is indicating to that only. Might be in future, the science could discover more on this to teach some skill to the fetus in the womb as well.
Our medical science has discovered that every person`s thumb impression is unique. Thousands years ago, Aghastya Maha Rishi used thumb impression to predict the future of the individuals. This knowledge is even being used today to predict the future of the individuals. The rishi had the knowledge of the uniqueness of the thumb long-long before the science has discovered. Lord Shiva ejaculated to see Vishnu in the form of Mohini, Vishnu collected the sperm. Then they went to jungle, where a renounced nymph named Anjani was penancing. They shed the sperm in the womb of Anjani without her prior knowledge. Hanuman took birth from Anjani as a RudraAvatar. This indicates the sperm implantation, which is widely being used in medical science. In Mahabharata, Kripacharya, Kripi and Droncharya had not been gestated in a womb, but outside the human body. Shardwan`s ( grandson of Gautama maharishi) semen fell on some weeds by the wayside by citing a nymph sent by Indra, dividing the weeds into two - from which a boy and a girl were born named Kripa and Kripi. One more rishi Bhardwaj had similar situation, he captured the fluid in a vessel called a drona, and Drona/Dronacharya himself sprang from the fluid. This was an indication of giving birth of child without mother womb. In medical science, it is called incubation.
Due to a curse, Pandu was unable to procreate child with his wives. Kunti had boon by Durvasha rishi to have child from any deity whom she desires to. She and Madri had 6 sons including Karna from different deities (gods). In medical science, this is called surrogate technology. Shikhandi was eunuch. By boon of a Yaksha named Sthulkarna, Shikhandi got manhood and copulated with his wife. These days, The problem of eunuch can be treated by surgery in medical science.
Once again, Vishnu took the form of Mohini to enchant demon for the sake of welfare. Shiva, the hermit also got enchanted with Mohini. Hence, Ayyapa took birth from Mohini and Shiva. It was sex conversion of Vishnu. Today, the facility of sex conversion is available in medical science. To fight with Mahishasura, all gods all together created Durga with their powers and provided their weapons to kill Mahishasura. This is an indication of hybrid possibilities. This has been already tested on animals and plants. In future, medical science might discover the hybrid possibilities in human beings as well.
There are many theories, ideas and hypotheses have been told in Indian mythology which has been experimented today in medical science. And many more hypotheses and ideas are still inviting science to do more experiment and discoveries. We should never do the mistake to scoff the mythological ideas; rather we should capture the fresh impetus and ideas hidden within it.