Learners read about endospores and view video clips demonstrating spore staining procedures. Correctly stained slides are shown.

In this animated object, learners examine how the heating or cooling steps in a manufacturing process work to control a chemical reaction.

Students read about how to make the plural form of nouns that end with "f" or "fe." They then complete an exercise.

Students review the rule for writing the possessive form of singular nouns that end in an "s" sound. They then complete exercises.

Students read about how to make the plural form of nouns that end in "y." They then complete an exercise.

In this accounting learning object, students follow the steps involved in the closing process. Temporary accounts contain ending balances for a specified period and must be closed.

Students review the rule for pluralizing nouns ending in the letter "o." They then complete an exercise.

Learners answer questions about medication from a game board with the headings "Pituitary," "Thyroid," and "Adrenal." Up to three people can play at one time. Contestants "buzz in" their answers to accumulate points.

In this animated object, learners examine the major events that occur at the neuromuscular junction.

In this screencast, learners examine the properties of the peptide bond and how the bond relates to the structure of hair.

In this screencast, learners read about the seven hormones that help regulate blood glucose.

Learners identify nine glands in a matching exercise.

This video will demonstrate working with independent chucks on an engine lathe.

Students review the spelling rules for adding a suffix to a base word. They practice changing the "y" to "i" for some of the words that end in "y."

Students read about the Federal Reserve System's structure and goals and the tools it uses to control the flow of money and credit in the economy. At the end of this activity, learners are asked to write how they would solve specific economic problems if they served on the Fed's Board of Governors.

Learners examine two methods for converting an octal number to a decimal number. Exercises are provided at the end of the learning object.

Learners practice identifying land sections using land survey terms and maps. Feedback is provided at the end of the activity.

In this animated and interactive object, learners follow two methods for converting a hexadecimal number to a decimal number. They test their knowledge in exercises at the end of the learning object.

In this learning activity you'll review three interpretations regarding the separation of church and state.

In this learning activity you'll read about efforts to prevent the government from interfering with citizens' rights to practice their religious beliefs.