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"One Liberian refugee wanted to outfit a phone with a land-mine detector so that he could more safely return to his home village. In the Dharavi slum of Mumbai, people sketched phones that could forecast the weather since they had no access to TV or radio. Muslims wanted G.P.S. devices to orient their prayers toward Mecca. Someone else drew a phone shaped like a water bottle, explaining that it could store precious drinking water and also float on the monsoon waters. In Jacarèzinho, a bustling favela in Rio, one designer drew a phone with an air-quality monitor. Several women sketched phones that would monitor cheating boyfriends and husbands. Another designed a “peace button” that would halt gunfire in the neighborhood with a single touch."