Each student will need a milk carton filled with good soil, bean seeds, string to support the plants, graph paper to record results, a pencil and a ruler to measure the growth. You need a sunny window to put the plants near as well.
Have each student plant their seed one inch deep, one per container.
Place your containers in a sunny window. Water the seeds daily or every other day. Poke holes in the bottom of the milk cartons (this will keep roots from rotting).
Divide your class into groups of four and, first, have students measure and record the length of each member’s smile in their group. Have them compare their results with all members of the group. Students return to seats as you record each of their measurements on the board. Students need to record the results of each student’s smile as well at their seat.