Biology - Human Reproduction

Today I was learning about sperms travelling to the egg and it was very interesting. It said how the sperms have to travel seven-inches to get to the egg and the egg has the power to excite them. Once a sperm has got into the egg the egg seals itself shut. When people have twins that are not identical that is when two sperms each enter into different eggs. Sperms that do not make it into the egg rest their heads on the fallopian tube. They can survive like that for several days. If you are interested in this I recommend this book Beginning Life. You can get it from Amazon here

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