Here's a cute invention in the works, a solar-powered lunch box.
Made up of three individual compartments, the Sunflower Lunchbox can heat and cool each compartment as your heart desires. Each compartment comes with its own display to control the temperature of its contents.
The lunchbox runs on solar energy which is stored in an internal battery. Once the compartments are collapsed together, the electrical circuit is able to run through the petals to heat or cool the contents.