1. Kushal put his timepiece on the table in such a way that at 6 p.m. hour-hand points to North. In which direction the minute-hand will point at 9:15 p.m.?

Saturday night, many Americans will take a minute to push their clocks forward an hour. At least, they’ll need to do that for those clocks that will not spring forward automatically. It’s the ...

All products featured here are independently selected by our editors and writers. If you buy something through links on our site, Mashable may earn an affiliate commission. Alarm clocks might seem ...

Atomic clocks. They almost sound like something out of science fiction, or an experiment confined to some elite physics lab, but in reality, they’ve been around since the 1950s in one form or another.