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.
Cat's Eye Chrysoberyl is both a popular and extremely valuable gemstone that is genuinely rare, being found only in a few deposits in the world. The chrysoberyl, with its hues ranging from honey-colored to mint green, is a popular gemstone, and one which is esteemed by gemstone lovers the world over.he color in yellow chrysoberyl is due to Fe3+ impurities. Cats eye chrysoberyl is a very hard material, with a hardness of 8.5 on the Mohs scale. Chrysoberyl has distinct cleavage and a vitreous surface luster. Chrysoberyl has a refractive index of 1.745.