My son is now studying the subject of Biology (from a correspondence course, from the USA). Nice, very detailed explanations; lots of pictures in full color.
Now he is studying the chapter on DNA, several pictures and models of the DNA molecule are shown - all of them a right-handed double helix. Again in full color, of course.
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)
