This is an article from Curious Kids, a series for children. The Conversation is asking kids to send in questions they’d like an expert to answer. All questions are welcome – serious, weird or wacky!

A permanent magnet is always magnetic. It has an invisible magnetic field. Only certain materials, such as iron, feel a magnetic force. Permanent magnets can come in lots of different shapes and ...

Some of the most sensitive methods of measuring magnetic fields use interactions of resonant light with atomic vapour. Recent developments in this vibrant field have led to improvements in ...

But they suffer from a fundamental drawback — to image individual atoms, samples have to be placed in strong magnetic fields. This makes it impossible to image materials that are strongly ...

Earth's magnetic field occasionally bursts into song — but these compositions are written with electromagnetic radiation, not sound waves. When converted to audio signals, though, these strange ...

Experts are urging parents to keep young children away from tiny, strong magnetic toys following a series of accidental ingestions that caused serious internal damage. The Consumer Affairs Agency ...