Sciences
Mathematics
Tutorials (learning)  Howto guides (goals) 



Explanation (understanding)  Reference (information) 

The commands in Mathematics category 
Chemistry
The Chemistry Central Page. ConTeXt comes with PPCHTeX, an extensive chemistry module which allows the drawing of chemical structures and the typesetting of reactions.
The pages in Chemistry category.
 ChemML (MathML extension for chemistry) by Pragma
Physics
The Physics Central Page.
The pages in Physics category.
 PhysML (MathML extension for physics) by Pragma
Generics
Sciences also use a lot :
 Units
 Graphics like diagrams, Flow_Charts, Chromatograms, graph module based on MetaPost.
 Steps (XML step charts, by Pragma). This module is written in the process of defining a couple of styles for an educational math book.The macros provide you a way to visualize steps in for instance solving equations.
 Proclaim: In PlainTeX there is the command \proclaim which is very handy when writing mathematics and stating theorems, lemmas, definitions and so on.