The children conducted an experiment to see how changing the environments which cress grows in affects how it grows. They have closely monitored the progress and changes. The real surprise was the cress which we tried to limit the amount of air it had because we ended up creating a small microclimate that turned out to be really good for growing cress. We thought this could be useful knowledge for growing plants on other planets like Mars! The seeds that had no water did not sprout and the the plants with no light failed to make chlorophyll and so were yellow and unhealthy.