12 most iconic rivers on Earth. The Yangtze River's most famous sites include the incredible Three Gorges and the gargantuan Three Gorges Dam. There's a reason you know the names of these rivers--the Nile, the Mississippi, the Amazon--they've inspired exploration, legend, religion. Discover the waterways that shaped the world--and the cruises that reveal their secrets.
Illustration depicting ovulation and fertilization. Human fertilization is the union of a human egg and sperm, usually occurring in the ampulla of the uterine tube. The result of this union is the production of a zygote cell, or fertilized egg, initiating prenatal development.Scientists discovered the dynamics of human fertilization in the nineteenth century.The process of fertilization involves a sperm fusing with an ovum.he result of this union is the production of a zygote cell, or fertilized egg, initiating prenatal development. Scientists discovered the dynamics of human fertilization in the nineteenth century. The process of fertilization involves a sperm fusing with an ovum.
Fertilization and Implantation Symptoms. When the egg is ready for fertilization, it travels from the ovaries into the fallopian tube, where it will fertilize with the sperm if you have had unprotected sex in your fertile period of your cycle. This fertilized egg travels to the uterus and plants itself on the wall. This is called implantation. Implantation is the implanting of the fertilized egg or embryo or even called a blastocyst on to the uterine wall. It takes place about 2-3 weeks after ovulation. Soon after fertilization, symptoms also occur about 2-3 weeks after ovulation.