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Zhao wai sze uploaded new media (2 September 2011 23:24:18 HKT)
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s100385 uploaded new media (2 September 2011 23:22:22 HKT)
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s100385 uploaded new media (2 September 2011 23:07:16 HKT)
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s100385 uploaded new media (2 September 2011 23:01:42 HKT)
air pressure
Today, we will show a video about air pressure.
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First,we prepare a cup,some water and a piece of paper.
Next,we put a...
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hermanlau added is project-bouncing balls to favorites (2 September 2011 22:37:04 HKT)
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hermanlau uploaded new media (2 September 2011 22:34:36 HKT)
