This week’s questions

LET THERE BE LIGHT

I recently had a power cut. The local street lights went out, and all the houses were blacked out. But to my surprise, I discovered the LED light bar over my fish tank was still on. Does this mean there was still power coming through? If this is case, could I foil a power cut by installing LED room lights? Steve Krafft Orpington, Kent, UK TRANSFORMING TEE I have a T-shirt that appears to be black and grey in normal light. But when seen through sunglasses,  it seems to be a deep red-purple. This also happens when the T-shirt is inside a green tent. It appears normal in the early morning and late evening, so it doesn’t seem  to be a lack of light causing the colour change. What’s going on? Lewis O’Shaughnessy By email, no address supplied WHY LIE? Lying seems to be pretty much standard human practice: it seems virtually everyone does  it to a greater or lesser extent.  So why do we hate being caught? Paul Loker Guildford, Surrey, UK