Flowers!

Women on the right side of ovarian eduction of 23 x came follicle choose 23 Y male male sperm by (grant) fine after the embryo in the male sperm under the action of the Y chromosome, embryo differentiation development towards the boy; Women left ovarian eduction of 23 X ♀ follicle selection of 23 X female sperm from female (grant) fine after the embryo in the female sperm under the action of the X chromosome, embryo differentiation development direction to the girls; This is one of nature given the nature of human beings

shows a whole range of cultural and temporal icons - the ink well, oil lamp, binoculars, pen, postage scale, etc. The changes from that photograph's time to the present span only one long-lived person's lifetime!