Lateral Thinking: Assuming that you are paying, is it cheaper to take one friend to the movies twice, or two friends to the movies at the same time.
(It does not depend on the amount of popcorn or drinks you purchase)
Today in class: Properties of matter.
http://www.dailymail.co.uk/sciencetech/article-1349383/Betelgeuse-second-sun-Earth-supernova-turns-night-day.html
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