Answers to Technology Questions

We're using electric chargers to charge phones, torches and things. Once the product is charged does the charger...

I often use silicone sealer, the kind of stuff you put round the bath. The only thing that seems to finish it off into...

What's the smallest thing you can detect in the body with an MRI or a CT scan? Is it 10 millimetres or smaller?...

How do laptop mousepads and iPod scroll wheels work?

Can magnetic anti-shoplifting strips get reactivated after your purchase, causing alarms to go off? How do they work?

If bats can do this, why aren't aeroplanes equipped with the same sort of things?

I know cassette tapes are virtually obsolete, but I have a question about them. Very often when I'm listening to...

What are magnets made out of and how are they made?

On a recent trip to Sweden I noticed at the check in desk that my mobile battery was running low and was just about to...

Why do cars smell like rotten eggs after a while? Is this down to catalytic converters?

Why does compressed natural gas, or methane, burn cleaner than regular fuel? It's still a hydrocarbon. Why shouldn...

I've watched astronauts go to lots of trouble trying to install solar panels onto space stations. Why haven't...

I want to know why a drink can doesn't get shaken up when it falls from a drink dispenser. It falls very hard but...

In my car, if you keep the air conditioning on rather than having the windows open, it makes quite a difference to the...

I've been following the progress of solar panels and hear that they're only about 16% efficient. What's...