two things.
Firstly, and most importantly, what do blind people, specifically blind from birth, what to they dream of?
Secondly, can you determine the sex of a moth, or butterfly, at the caterpillar stage.
(lordy lordy, Fri 14 Oct 2011, 15:46, 11 replies)

Blind from birth
they can't dream IIRC
( Signify, Fri 14 Oct 2011, 15:51, closed)

What do you *think* they dream of?
Gwan, have a guess.

Also, by putting into google "can you determine the sex of a moth, or butterfly, at the caterpillar stage", I got this:

www.ehow.com/how_8360615_figure-out-caterpillars-gender.html

Granted, things don't look too good for the caterpillar, but there it is.

Amazing. The Internets. How do they work?
( Michael Ellis contributes nothing, Fri 14 Oct 2011, 16:08, closed)

Thanks duke. But it doesn't answer the question. If you open a pupae there's nowt inside but a soup of stuff, somehow something just does whatever, and a moth appears, so is the dna apparent at the caterpillar stage, or does it happen at the big bang part..
Internets don't help, but there's a plethora of incredibly intelligent people here, and possibly a lepidopterist.
(lordy lordy, Fri 14 Oct 2011, 19:01, closed)

Well, you learn something new every day*.
I thought that sex was likely determined by then, but wasn't completely sure so I googled it.
Turns out that butterflies have a Z chromosome and an X chromosome (both passed on by the mother) and presence of both means female and one of each means male.
Source: biology.about.com/od/basicgenetics/p/chromosgender.htm
*At least I do**.
**Well, OK, not every day but quite often.
(Me, I'm not... in any way intoxicated, Fri 14 Oct 2011, 21:00, closed)

So...how do you determine
if you have both kinds of chromosome, or merely one of each?
(Falstaff's Spiritual Successor, Fri 14 Oct 2011, 23:30, closed)

doh
I, of course, meant only Z means male and both means female.
(Me, I'm not... in any way intoxicated, Sat 15 Oct 2011, 0:18, closed)

To determine the sex of a caterpillar
feed it 10mls of water and wait 30 minutes and watch it to see if it goes into the ladies or gents.
(TitanLX, Fri 14 Oct 2011, 16:57, closed)

hahahah

( Michael Ellis contributes nothing, Fri 14 Oct 2011, 17:04, closed)

put it on a horse
if it sits sidesaddle, it's female
( Smash Monkey lowering the tone of the whole internet, Fri 14 Oct 2011, 18:45, closed)

Or the classic,
Tickle it, if he laughs, its a boy, if she laughs, its a girl!
(lordy lordy, Fri 14 Oct 2011, 19:03, closed)

People who have been blind from birth
have auditory dreams, not visual dreams (sound, not pictures)
(Heggy, Wed 19 Oct 2011, 19:30, closed)