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xilman 2021-10-08 16:58

[QUOTE=Dr Sardonicus;589897]I did not know that! Lucky for me, I'm not too old to learn.

Botanists use the term "rays" for what the rest of us call "petals" on composite flowers like daisies. The actual flowers are in the "eye" or "button" in the center.[/QUOTE]Thank you!

I am also not too old to learn.

PhilF 2021-10-08 21:19

[QUOTE=xilman;589880]Who is this "we" Kemosabe?

A fair fraction of people can see a little way into the uv, far enough to see the uv-coloured tips on daisy petals for instance. To me they are far from obvious but visible under careful examination when they appear as a very faint lavender-grey colour.[/QUOTE]

I didn't know that either! How can I test my own uv vision?

Safely, of course. :cool:

PhilF 2021-10-08 21:32

[QUOTE=greenskull;589896]Hello! :)

Try this color perception test and put here your results.
[url]https://www.xrite.com/hue-test[/url]
[/QUOTE]
I scored a 2.

greenskull 2021-10-08 21:34

[QUOTE=PhilF;589953]I didn't know that either! How can I test my own uv vision?

Safely, of course. :cool:[/QUOTE]

Most people are trichromats. But some part has tetrachromatic vision. I admit that they are the ones who can see a little further than violet.
[url]https://en.wikipedia.org/wiki/Tetrachromacy[/url]

[QUOTE=PhilF;589956]I scored a 2.[/QUOTE]
Pay attention to which part of the spectrum is the error.


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