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.
Malcolm X with browline glasses. Browline glasses are a style of eyeglass frames which were very popular during the 1950s and 1960s, especially in the United States of America. The name derives from the fact that the bold upper part of the frames frame the lenses in the same way that eyebrows frame the eyes. The glasses were first manufactured by Shuron Ltd. in 1947 under the Ronsir brand and quickly emulated by various other manufacturers.