They are starting to form an awareness of their own personality and identity, something that up until now hasn't bothered them at all.
The group of six-year-olds bought together for the social experiment: Front Row L-R Kash, Beatrice, Taye and Caitlyn. Back row L-R Charlie O, Xois, Casper, Austyn, Poppy, Marley and Charlie MDr Wass said this type of play is important in child development as 'exploring gender by temporarily stepping over the gender divide can be an essential tool for children to work out what gender really means.'Another of the little boys, Caspar summed up the differences in the sexes in the following way: 'When boys grow up they have big or little moustaches.
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Because it is a fully balanced configuration, the straight-six can be scaled up to very large sizes for heavy truck, industrial and marine use, such as the 16 L (980 cu in) Volvo diesel engine and the 15 L Cummins ISX used in heavy vehicles.
The largest are used to power ships, and use fuel oil.
The straight-six can also be viewed as a scalable modular component of larger motors which stack several straight-sixes together, e.g. Straight-six engines were introduced much earlier than V6 engines.
While the first straight-six was manufactured in 1903 by Spyker, it was not until 1950 that a production V6 was introduced.
Dr Sam Wass, a development psychologist observing the blue and pink box experiment, said he was not surprised by the colours the children chose or by the boys' initial reaction to the clothes they were presented with.
He said: 'Six-year-olds are at a stage of working out who they are relative to other people and this comes across as great curiosity about how they are different to their friends.
As of 2009, the Cummins B Series engine used in Dodge Ram pickup trucks displaced up to 6.7 L The Gipsy Six and Gipsy Queen, made by the de Havilland Engine Company from 1935 until 1950, were inverted straight-six engines displacing 560.6 cubic inches (9.187 L).
They were used in a variety of aircraft including the de Havilland Dragon Rapide and the Cierva W.9 experimental helicopter.
Girls don't except for my grandma who had a moustache.' The show also revealed some interesting insight into how friendships are formed between the six-year-olds - who came from various backgrounds - and some seemingly start to develop romantic attachments.'Is this the start of what we see emerging in adolescence? 'Have we got it wrong, as we typically think of romantic and sexual development as occurring in adolescence but is it because we haven't watched young children enough to see it actually develops much earlier?