Finally, a top tip: when choosing thermal wear, bear in mind that base layer items such as T-shirts and leggings will be a snug fit (this is one way in which they retain heat), so, don’t size up ...

CLAD IN a white bunny suit that leaves only his eyes exposed, S.V. Sreenivasan carefully picks up the slender object that lies at the heart of the global economy, a silicon wafer. But this ...