Dominoes spots from one to six are generally arranged as they are on six-sided dice, but because blank ends having no spots are used, seven faces are possible, allowing 28 unique pieces in a double-six set. However, this is a relatively small number especially when playing with more than four people, so many domino sets are "extended" by introducing ends with greater numbers of spots, which increases the number of unique combinations of ends and thus of pieces. Each progressively larger set increases the maximum number of pips on an end by three, so the common extended sets are double-nine, double-12,
Double standard of aging was determined that both males and females were judged lower in attractiveness as they aged; however, the difference in ratings of attractiveness due to age was much greater for women than for men. This study also found a difference in judgement in terms of masculinity and femininity. For men as they aged their attractiveness was judged as decreasing slightly and when judged based on masculinity there was no change. The women in the other hand were judged far less attractive with age as well as being less feminine. Double standard of aging The double standard principle can be applied to