DAMMAM, Saudi Arabia (AP) — Karim Benzema starred on his return from injury with a goal and two assists as Saudi Pro League leader Al-Ittihad won at Ettifaq 4-0 on Saturday.

The "BR" stands for "bulging reflector," and it means that the light inside the bulb sits above a reflective bowl, sort of like a little satellite dish. Screw a bulb like that up into your ceiling ...

A weekly programme that illuminates the mysteries and challenges the controversies behind the science that's changing our world.