女生小视频

Edible fruits and vegetables come in practically every shade of green, red and yellow. Why are so few of them convincingly blue in colour?

Duncan Hutchinson, Newton Abbot, Devon, UK

We pay 拢25 for every answer published in New 女生小视频. To answer this question 鈥� or ask a new one 鈥� visit newscientist.com/lastword. Terms and conditions apply.

This article appeared in print under the headline 鈥淭hose veggie blues鈥�