Happy Winter Solstice! At 1:40am local time, winter officially begins!  It is called the 'winter solstice' and marks the shortest number of daylight hours during the year.  The 'summer solstice' occurs in 6 months time and is the most daylight hours of the year.  The times are reversed in the southern hemisphere, so Dec. 22 is the first day of summer in Australia.  Click on the link below into your browser to get a more detailed explanation of how it happens.http://www.timeanddate.com/calendar/december-solstice.html Science 9:Apollo MissionsRead Section 16.3Science 10:Acceleration (see below)p. 388, #2-5, 7-14Physics 11:Hooke's Law and Elastic Potential Energy (see below)\p. 258, #35-37p. 261, #38-40Biology 11:Earthworm Dissection