HAEBARU TOWN, Okinawa — A 6-year-old Japanese girl stood with her back to Defense Department students gathered Thursday to learn about the Japanese abacus, or soroban, at the Tsukazan Community Center ...

The abacus, that ancient, no-batteries-required, bead-based calculator, is making a comeback in after-school programs across Canada. The schools, which are modelled after programs common across India ...