Maker Manu (@mrcatacroquer) is one inventive grandson, and he has warmed the cold hearts of Twitter with his Raspberry Pi-powered creation Yayagram. Manu’s mission was to help older family members keep in contact with their grandchildren. What does Yayagram mean? It’s a portmanteau, a mashup between the words “Yaya” and “telegram.” Yaya means “Granny” in…

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