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The Incredible Light Bulb / Egg Drop Challenge! http://passporttoknowledge.com/mars/involved/eggdrop.html
This activity was originally written to simulate the Mars Pathfinder landing on Mars. The Mars Exploration Rovers will use the same airbag system that the Pathfinder used. This is a great activity to explore landing an egg safely on Earth.
Bill Nye and some of the ATHENA science team transform a calibration tool into the first sundial to land on Mars. And you can make a replica which tells time here on Earth.