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.
Most Popular Sunglasses. are much more popular than others. This is because when people find sunglasses that work, they want to stick with them. There is nothing like a good pair of sunglasses helping you do what you do best in the sun. One of the most popular sunglasses models of all times is the Ray Ban Aviator sunglasses model. Next is the Ray Ban Wayfarer. Designer sunglasses have been a defining fashion feature for virtually every celebrity. Beginning with Elvis and John Lennon, and now everyone from Clint Eastwood to Lindsey Lohan .