42eXplore
Subject pathfinders and free classroom tools.
42eXplore publishes short reference pages on school subjects, plus a small set of free calculators for classroom use. Each topic page defines the idea, explains how it is taught, and points to where the subject is studied in more depth.
MicroscopyCompound microscope parts, objectives, and imaging modes
Classroom calculatorsBoolean algebra, truth tables, linear systems
All topicsThe full subject index
Skimming and scanningTwo reading rates and when to use each
Number systemsBases, place value, and conversion
StatisticsDescribing and comparing data sets
About this site. 42eXplore has published subject pathfinders since the early 2000s. Pages are written for teachers, tutors and students aged 13 and over.