If you find yourself drawn to embryonic development, a great resource is https://www.embryo.nl/
> Then I have ‘bad news’. The story is completely outdated. A few dozen, sometimes hundreds of sperm cells enter into a biological conversation with an egg. It is about exchanging with each other, in order to eventually merge. Penetration is not the word for what is happening here. Call it a cellular mating dance.
This is clearly nonsense as IVF works fine.
https://en.wikipedia.org/wiki/In_vitro_fertilisation#Co-incu... The sperm and the egg are incubated together at a ratio of about 75,000:1 in a culture media in order for the actual fertilization to take place.