Â鶹´«Ã½

Are fruits and vegetables grown under glass, plastic or artificial light as nutritious as ones grown outside in direct sunlight?

Georgina Seaman

Newbury, Berkshire, UK

I am at the rear wall of my spaceship travelling at the speed of light. I switch on my flashlight. Will the light reach the front wall?

Tony Woodward

Portland, Oregon, US

To answer this question – or ask a new one – email lastword@newscientist.com.

Questions should be scientific enquiries about everyday phenomena, and both questions and answers should be concise. We reserve the right to edit items for clarity and style. Please include a postal address, daytime telephone number and email address.

Â鶹´«Ã½ retains total editorial control over the published content and reserves all rights to reuse question and answer material that has been submitted by readers in any medium or in any format.

Terms and conditions apply.