We both must try to understand complicated systems with intricate feedbacks and uncertain causality.

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They welcome Britain's first-past-the-post electoral system precisely because it creates stable, democratic government invulnerable to the uncertain coalitions that "fairer" voting systems have inflicted on countries like Holland.

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Astronomers are uncertain if this represents a genuine rarity of systems like our own, or a simple self-selection problem in which our current technology only has the sensitivity to pick up the weird systems.

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China, judging by the gray with which it is depicted in the slide, is still uncertain, even though HP hopes to sell it there through its own Personal Systems Group.

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During the next three days they will look at how TVET systems cans be reinforced and expanded to deal with rapidly changing and uncertain labour markets and high levels of unemployment coupled with diminishing natural resources, environmental deterioration, climate change and rapid population growth.

UNESCO: Social and Human Sciences