While in the womb, foetuses are free to somersault in their amniotic sacs, and this constant movement has so far hindered clear images of growing brains.
BBC: Babies' brains to be mapped in the womb and after birth
Mr White said over the past 10 years there had been a constant movement of population from the "Donegal side of the Foyle" to the east bank and other parts of Northern Ireland.
BBC: News - Fears over Protestant exodus from Derry west bank
The fact that there's little control over the applications users can install on a mobile device makes them an easy target to exploit, and the constant movement between home and work networks creates unwanted access possibilities.
Yet the European champions were soon being cut open as Chile, whom some observers consider to be a South American version of Spain, attacked them with short incisive passes and constant movement off the ball in support of their team-mates.
These vast networks carried more than just merchandise and precious commodities: the constant movement and mixing of populations also brought about the transmission of knowledge, ideas, cultures and beliefs, which had a profound impact on the history and civilization of the Eurasian peoples.
It allowed for protest, and movements, and the dissemination of new ideas that would repeatedly, decade after decade, change the world -- a constant forward movement that continues to this day.
WHITEHOUSE: President Obama Speaks at Barnard College Commencement Ceremony | The White House
Tidal current: movement of water in a constant direction caused by the periodic rising and falling of the tide.
The steps get heavier and the speed increases until listeners are drawn into the movement of the rivers and the mills, the frenetic pace of an urban center in constant motion.
In the constant battle between fostering too much change (at the risk of creating turmoil) and being content with too little movement (which leads to stagnation) Mr FitzGerald seems to be getting the balance about right.
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