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Set theory, a set is a collection of objects (called members or elements) that is regarded as being a single object. ... A set A is called a subset of a set B (symbolized by A ⊆ B) if all the members of A are also members of B. For example, any set is a subset of itself, and Ø is a subset of any set. Click on the heading above to start this lesson.

  

Africa is the second-largest continent on the planet. It covers 20% of the land surface on earth. It has 54 recognized sovereign nations, two disputed states, and nine territories as shown in the Africa Map. Africa is home to a wide range of wildlife, terrain, and climates. (mapsofworld.com) Click on the heading above to start this lesson.

The musculoskeletal system provides form, support, stability, and movement to the body. It is made up of the bones of the skeleton, muscles, cartilage, tendons, ligaments, joints, and other connective tissue that supports and binds tissues and organs together. (Wikipedia) Click on the heading above to start this lesson.

          

This topic teaches English while looking at school holidays. At the end of the term, everyone is looking forward to a break from school. Vocabularies are used the same way as used during the holiday period or when the learners are at home. Click on the heading above to start this lesson.