Using natural body heat or temperature to light up LEDs
Many students these days are experimenting with peizo-electric theory to generate electricity and lighting things up. Combining this theory with the seeback effect, LED lighting is made possible.
Selecting the right type of material that will generate a charge due to temperature difference is critical in lighting up an LEDs.
The amazing thing about LED is the low voltage and current required to light up. This really enable many different applications and electrical generating methods to be applied.
E.g an awesome student in Canada using body heat to light up a torch light. All these without a need for battery.
This might just replace solar panels or be an additional arsenal towards our go-green campaign. This form or renewal energy is both free (from the body heat point of view) and seemingly perpetual.