lefthandedness

**jeanette** Wed Sep 08, 2010 7:55 am

I saw a programme, a few years ago, on t.v. and they said that everyone who was lefthanded started off as a twin, but for whatever reason nature changed it's mind.
I thought I posted this yesterday, but I don't see it anywhere.
Jeanette.

**Helen** Thu Sep 09, 2010 5:50 pm

Hm... Interesting theory. From my experience Left Handiness is gynetic. My aunt and my father-in-law are left handed, so does my daughter.

southpaw Fri Sep 10, 2010 7:06 pm

It's predominant in my family....grandma, sister, my daughter, my aunt...my other grandma might be....I think I'm forgetting someone lol

**Martijn (admin)** Sun Sep 12, 2010 10:31 pm

jeanette wrote:I saw a programme, a few years ago, on t.v. and they said that everyone who was lefthanded started off as a twin, but for whatever reason nature changed it's mind.
I thought I posted this yesterday, but I don't see it anywhere.
Jeanette.

Hi Jeanette,

This phenomenon is better known as the 'vanishing twin theory' - which was developed by Charles E. Boklage in 1995 (based on mathematical considerations), see: http://en.wikipedia.org/wiki/Vanishing_twin

But in 2002 Australian researchers have proven with observations that the 'vanishing twin theory' is incorrect, see: http://www.abc.net.au/science/news/health/HealthRepublish_505182.htm

So, this rather remarkable theory about left handedness has never been substantiated with any direct evidence, so we better describe it as an OUTDATED theory that has not survived the test of time.

lefthandedness 399964

**jeanette** Mon Sep 13, 2010 7:34 am

Thanks Martijin,
Very interesting.
Jeanette.

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