breakthrough was a termly resource for teachers published between 1999 and 2001. Each edition highlighted a number of discoveries and inventions and the people who made them. This edition was published in September 1999. Each edition of breakthrough included feature articles and regular items such as profiles of...

With this simulation students can test the pH of everyday liquids such as coffee, spit, and soap to determine whether each is acidic, basic, or neutral. They can also investigate how adding more of a liquid or diluting with water affects pH. Sample learning outcomes include:

• Determine if a solution is...