Curated OER
Protagoras
In this online interactive philosophy learning exercise, high schoolers respond to 10 short answer and essay questions about Protagoras by Plato. Students may check some of their answers on the interactive learning exercise.
Curated OER
Protagoras
In this online interactive philosophy activity, students respond to 30 multiple choice questions about Protagoras by Plato. Students may submit their answers to be scored.
Massachusetts Institute of Technology
Mit: Internet Classics Archive: Works by Plato
A library entry with translations of many works by Plato, including commentary and discussion of each.
Other
Plato and His Dialogues: List of Plato's Works
This list of works by Plato such as The Republic also features links to e-texts in English translation.
Massachusetts Institute of Technology
Mit: Internet Classics Archive: Protagoras
This site from the Internet Classics Archive provides the full text of Plato's dialogue, "Protagoras." Translation by Benjamin Jowett.
Other
The Sophists and Socrates
Wonderful essay on Socrates refutation of the Sophists. Discusses Socrates' debate with Protagoras over the meaning of "arete" (justice) and its consequences for the democratic politics of Athens.
Other
The Sophists
A summary on this group of "teachers" and their beliefs. The author identify some of the major "Sophists" and their ideas.
Stanford University
Ancient Skepticism/stanford Encyclopedia of Philosophy
An excellent, detailed, and lengthy overview of the ancient Skeptic tradition. Divides into Pyrrhonic and Academic Skepticism. Includes many quotes and a full bibliography as well. A superb treatment of the subject.
Internet Encyclopedia of Philosophy
Internet Encyclopedia of Philosophy: The Sophists
This site from the Internet Encyclopedia of Philosophy provides a good summary of the Sophists, their history and motives. Lists major figures.
Science Struck
Science Struck: History of Optical Illusions
Discover the philosophers and scientists who studied optical illusions and some of the techniques used to create the illusions.