Smart sand that learns like neural nets. Recipe goes like this: Mix semiconducting grains and metal and solder bits. Apply electric pattern at one end of the bu

Smart sand that learns like neural nets. Recipe goes like this: Mix semiconducting grains and metal and solder bits. Apply electric pattern at one end of the bucket and shake the bucket until some useful pattern appears at the other end. Then you apply much higher current between those patterns. Solder bits melt and form more permanent neural routes. Repeat until the device works as expected.