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.
According to the BBC, the glasses used âKalichrome lenses designed to sharpen details and minimise haze by filtering out blue light, making them ideal for misty conditions.â In 1999, the Global Eyewear Division of Bausch & Lomb, including Ray-Ban was acquired by Luxottica Group for US$640 million. Sunglasses lines. Ray-Ban's most popular sunglasses are the Wayfarer, and Aviator models. During the 1950s, Ray-Ban released the Caravans