I meant to take a picture of a drop of blood (full of DNA "spirals") but had barely time to breathe this month. Maybe some other time Come to think of it, robthebold's was the only entry containing actual spirals. All the other ones were helixes: https://en.wikipedia.org/wiki/Spiral https://en.wikipedia.org/wiki/Helix I do realize that some languages do not make the distinction. Including colloquial English