Multimedia resources:

• “The Couch Potato” by Jory John and Pete Oswald (6:13 minutes)
• How do solar panels work? - Richard Komp (4:59 minutes)
• Can 100% renewable energy power the world? - Federico Rosei and Renzo Rosei (5:54 minutes)

For the teacher before the activity:

• tape
• 4 oz. TiO₂ (titanium dioxide)
• 1 oz. white vinegar
• 1 stirring rod
• 1 small beaker
• 1 hot plate
• (optional) cotton swabs

Each student needs:

• 1 Engineering Notebook
• 1 writing utensil
• 1 lab coat, apron, or piece of old clothing
• 1 pair of protective glasses or goggles
• 1 pair of gloves

Each group needs:

• 2 pieces of conductive glass with pre-deposited titanium dioxide (TiO₂) (See instructions in the Before the Activity section for how to make and apply the TiCO₂ paste.)
• 2 #2 pencils
• 1 zip lock sandwich bag
• 1 mortar and pestle (for spinach)
• 1 fruit or vegetable
• 1 spoon
• 1 pipette
• 1 tweezer
• 1 multimeter
• 1 wash/squirt bottle
• 2 binder clips
• paper towels

For the entire class to share:

• 1 laptop or table (to show videos)
• 1 projector (to show videos)
• 1 bottle of iodide electrolyte (teacher will put on cells)
• 1 digital scale
• raspberries
• spinach
• blueberries
• cherries
• blackberries