Electromagnetic induction, represented by either Faraday's law or the Lorentz force law, produces many paradoxes requiring careful examination and application of these laws. The paradoxical example of induction, presented herein, arose in a class and is resolved within the framework of special relativity.

Plans are under way to redefine the International System of Units (SI) around 2018. The new SI specifies the values of certain physical constants to define units. This article explains the new SI in order to provide a resource for high school teachers as well as for advanced students already familiar with the pre-2018 SI.

Describes and analyzes several problems physics teaching assistants (TA) may encounter, offering possible solutions to the problems. Areas addressed include administrative details of the lab/recitation and its relation to the lecture, objectives of lab/recitation sessions, goals for the recitation/lab TA, grading procedures, and others. (JN)