I've been buying these sets for years, growing our collection. My son loves them and plays with them every day... It tweeted his interest at 5, and continues to be a favorite at almost 11 years old. Although they are pricey, they are well made and definitely worth it. Highly recommend.
I taught 8th grade physical science for 30 years.....how I wish I had had sets of these in my classroom! I bought them for my Grandson for Christmas and we love them. They are well made and stimulate learning and exploration the hands-on way.....I ordered a second set!
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