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The newest exhibit at Chicago Children’s Museum is all about water. WaterCity! offers children endless opportunities to explore and play with water. Kids can design their own water experiments, ...

Students will learn how to categorize matter as either pure substances or mixtures. Students will apply tests, based on physical properties of matter samples, to determine whether a mixture is ...

Proceedings of the National Academy of Sciences of the United States of America, Vol. 106, No. 46 (Nov. 17, 2009), pp. 19334-19339 (6 pages) The bacterial spore, the hardiest known life form, can ...