Graphs serve as visual representations of objects and come in many forms. The basics can be taught as early as kindergarten. Divide the children into groups. Give each group 10 pieces of colored candy. Have the groups divide up the candy by color. Have them write down the number of pieces of each color. They can now create a simple bar graph showing the number of pieces per color.
The concept of density and how an object can have more or less density than another object can be most easily explained through experimentation activities. Take two eggs, two containers and salt for a simple density activity. Fill each container with water, except add salt to one container. Explain the idea that salt alters the density and then show this in action by dropping an egg in both containers. The egg will sink through the non-salted water, while remain floating in the salted water.
Teaching kids about the brain can be easy. Have kids perform several activities, such as writing, walking and winking. Tell them to record the hand they write with, foot they begin to walk with and which eye they naturally use to wink. The dominant brain hemisphere within each student will generally be the one opposite to the hand, foot or eye they used.
Teaching the very basics of botany can be explained easily through activities for kindergarten students. Break students up into groups and have each group plant a lima bean in a small container filled with soil. Each group is responsible for watering and monitoring the plant every day. Over time, the seed will sprout and grow, which will serve as a visual interactive activity to accompany lessons about plants.