It’s summer, which means the kids are at home and you want them playing in the backyard — not indoors on their iPads. But simply telling them to “go have fun outside” rarely cuts it. Still, that doesn ...

Pale faces, shivers and goosebumps, and perhaps even a few nervous tummies. It’s not a fever; it’s just maths. Kids in India might not be scared of much these days, but maths may send them into panic.