Nigerian inventions

for cooling food, two clay pots of different sizes placed separately inside each other with moist sand

thumb | right | alt=A SOCCKET ball, which looks like a green Soccer/Football ball, being used to power a light. | The SOCCKET ball powering a lightSOCCKET was a soccer ball that harnesses and stores energy from play for later use as a portable power source in resource-poor areas. It was the flagship product of Uncharted Play, Incorporated (now Uncharted Power).