"Alexi, these nights are yours,” says the graffiti on the subway wall, addressed to the Athens schoolboy killed last Saturday, allegedly by a police bullet. The week of rioting and protest that has left the city in shards belongs, above all, to the young. It is a revolt of schoolchildren and students, most on the streets for the first time. There are reports of children as young as 12 battling riot police, shouting “Cops! Pigs! Murderers!"