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Grade 4
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Aquarium Habitats
How Long Can People Live?
The Clock Inside You
Menus from Mars
Alien Invasion
Science Scoops: Crime Scene Insects
Diving to Rescue Coral Reefs
How old can coral reefs be?
Try these simulations too:
Which star is the only one that doesn't appear to change its position in the sky?
What caused the Statue of Liberty to change color over time?
How fast does a stalactite grow?
