A brief explanation of aromatic compounds with more emphasis on substituted aromatics and polycyclic aromatics and heterocyclic rings. Oriented towards compounds found in plants. Includes models that can be rotated and examined in 3D.

For those that are unable to tour the Diefenbunker on a field trip, these pictures are a good substitute. Students can get an idea of what the interior is really like.

Articles with vegan recipes, vegan substitutes and a vegan coffee guide.

Gives basic info about a right triangle. Also students can substitute values for sides or angles in order to find missing values. The method for solving is then explained.

This Ptolemaic altar has images of loaves, trussed ducks, and vessels. These would serve as magical substitutes for real food offerings.

This is a heart amulet of lapis lazuli, made to be hung from a golden chain. It should have hung from the neck of the owner's mummy. The heart amulet (or a scarab) should be placed within the chest of the mummy as a substitute for the...

The amulet depicts a pair of fingers. In the netherworld, a pair of fingers could substitute for damaged body parts or organs and could be used for protection against magic.

This site discusses demand and the law of demand, and shows how a demand schedule can be transferred into a demand curve. It also explains how a change in the price of a substitute can cause your original demand curve to shift.

This site discusses demand and the law of demand, and shows how a demand schedule can be transferred into a demand curve. It also explains how a change in the price of a substitute can cause your original demand curve to shift.