Five of the best brain-training apps

Lumosity, Peak, Elevate, Fit Brains Trainer and Cognito are trying to help Android and iOS users keep their grey cells supple with daily workoutsIf anyone tries to tell you that daily brain training is a digital thing, hit them (gently) with a rolled-up newspaper that then opens to the crosswords page.That said, ever since the fictitious Dr Kawashima got people exercising their grey cells with a Nintendo DS, the brain-training genre has been popular on handheld devices. Smartphones and tablets a