The Heron's Fountain is a great project for a science fair. The project shows how potential energy can provide power, using water and gravity, and air and compression.
GIANT Chicken Coop Rabbit Hutch Hen Chook House Easy Access, both run and house has large doors for easy clean. Sliding door for living area, with internal door can be opened or closed from outside of the coop with the rob.
PVC Chicken Feeder - Here's a chicken feeder that's easy to fill, hard to spill, safe from non-chicken life forms, weather resistant, easy to make and inexpensive!
Tomato plants like deep watering. Why waste water when you can make a simple reservoir delivery system. The photo says it all. Tomato plants like deep watering.