Science for 4-6 year olds

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A local homeschooling co-op has asked me to teach a lesson between 30 and 45 minutes to about five kids at a time. The kids range from 4 to 6 years old.

What are some ideas for an age appropriate concept that I could build a lesson around? I'm in a tough spot because the parents are religious so I need to avoid subjects like evolution or anything suggesting the universe is greater than a few thousand years old.