people in the US? 1 as far as Im concerned. Standard time zones? 1, the rest are unstandard. the most muscles... first would be the act of my peinis getting hard, its so big it needs a crane and a few bull elephants to lift that thing... um, otherwise, it would have to be frowning. :(

Please ask unrelated questions separately. 1) "How many people are there in the United States of America?" "Population - 2008 estimate 305,386,000" Source and further information: http://en.wikipedia.org/wiki/United_States 2) "How many standard time zones are there in the world?" "Standard time zones can be defined by geometrically subdividing the Earth's spheroid into 24 lunes (wedge-shaped sections), bordered by meridians each 15° of longitude apart. The local time in neighboring zones would differ by one hour. However, political and geographical practicalities can result in irregularly-shaped zones that follow political boundaries or that change their time seasonally (as with daylight saving time), as well as being subject to occasional redefinition as political conditions change." Source and further information: http://en.wikipedia.org/wiki/Time_zone 3) "Which actions requires the most muscles to complete?" "We usually say that frowning requires more muscles than laughing. That is probably correct if we are comparing like with like, say a slight smile with a slight frown, or a medium laugh with a medium frown. 2 However, we should be careful about several things here. Firstly, when we say ‘more muscles’, do we mean a greater number of muscles, or a greater amount of muscle? The muscles of facial expression differ in size and bulk, so that could influence the answer. We also have to remember that the naming of muscles can be somewhat arbitrary, and sometimes for historical reasons tiny bundles of muscle fibers have been given their own name while other bundles are considered to be part of a larger set, which is named collectively. Secondly, as noted in our previous answer (see above) about the muscles used in laughing and smiling, it is likely that most of the 53 named facial muscles play at least some part in all these expressions, particularly when the expression is exaggerated - not to mention other groups of muscles such as the muscles of mastication and respiration. Thirdly, when we laugh happily we often generate quite a bit of noise, and this reflects muscular activity in the larynx, chest and abdomen. On the other hand frowning tends to be a relatively quiet affair, so it could be that a big laugh requires more muscles than a big frown. One way to check would be to compare oxygen use during laughing and frowning. While we wait for those results, I think it is probably best in the interests of energy conservation to laugh more than frown. " Source and further information: http://www.scribd.com/doc/2257021/12MuscSys