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.
The Ray-Ban Wayfarer Sunglasses Guide. Arguably, the Wayfarer is the most popular style of sunglasses sold around the world today. The favorite frames of JFK, Bob Dylan, and Andy Warhol, they cut across professional, style and cultural lines with ease to remain one of the most flattering and versatile sunglass shapes out there.