This week in Science we have been looking at light sources, shadows and sun safety. Our experiment to find out how objects bock light encouraged lots of discussion. Using different materials to see which would suit curtains for someone who sleeps in the day was a great way to explore suitability. This week in Science we have been looking at light sources, shadows and sun safety. Our experiment to find out how objects bock light encouraged lots of discussion. Using different materials to see which would suit curtains for someone who sleeps in the day was a great way to explore suitability.