Embryo implantation in humans. After fertilization the human embryo begins a 4 day long journey down the fallopian tube and into the uterus. When the embryo reaches the blastocyst stage it develops two distinct populations of cells. The outer cell mass,called the trophectoderm, and the inner cell mass.
Cat eye glasses. Named after their resemblance to the shape of a cat's eye, cat eye glasses are probably the most popular style of vintage eyeglasses. Though cat eye glasses were around since the 1950's, they reached their peak popularity when Audrey Hepburn wore a pair in the 1961 film Breakfast at Tiffany's.
Top 15 Lovely-looking Striped Breeds of Cat in the World. Tigers and Zebras are the most popular striped animals in the world. If you are a cat lover, I am sure you are aware that there are breeds of cat that are striped. Here are the most beautiful and remarkable striped cat breeds in the world.