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An Ice Lens
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  In this optics activity, learners discover basic lens-making techniques by using a tennis ball to make a lens out of ice.
  
Making Map Projections
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  In this activity about cartography, learners work in teams to create two different map projections: a planar (or polar) and a cylindrical (or Mercator) projection.
  
Magic Lanterns
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  A magic lantern is a light that projects an image onto a screen.