Over-the-counter pregnancy tests give potentially life-changing results with a pretty high rate of accuracy. But how do they work? Tien Nguyen explains how each test performs a scientifically rigorous, multi-stage experiment that goes...

What have students learned during this unit? What gaps do students have in their understanding? Students take the Unit 2 test.

What do students already know about integers, rational numbers, and the coordinate plane? What gaps do students have in their understanding? Students take the Unit 3 pretest in order to inform instruction.

This lesson focuses on teaching the vocabulary used in the rubrics for 4 of the 6 Traits of Writing. It requires students to learn the vocabulary used in the rubrics and to define the traits so they understand what is expected of them...

This lesson introduces students to the art of designing an airplane through paper airplane constructions. The goal is that students will learn important aircraft design considerations and how engineers must iterate their designs to...

PBS presents a lesson plan for teachers to use to educate young scholars on immigration to the United States which is a major issue in the election of 2004. Students can take a practice citizenship test to see if they can pass.

A quick guide to approaching questions that ask you to find an assumption required by the argument. This question asks you to identify the claim that must be true or is required in order for the argument to work. In other words, there is...