The Tehran government does not put obstacles in the path of young people seeking to emigrate.

NPR: Iran Facing Dangerous Brain Drain

Angela Merkel believes her legacy is tied to saving the euro, and will not allow Britain to put obstacles in the way.

BBC: Cameron's hardest speech

It has always baffled me that councils feel that they should put obstacles on roads which were created for the specific purpose of conveying traffic.

BBC: NEWS | UK | Scotland | Campaign to end speed bump 'pain'

Certainly, it makes no economic or social sense for Canadians to stop Australians or New Zealanders from looking for jobs, or for Europeans or Japanese to put obstacles in the way of Americans.

ECONOMIST: Managing the market

But the leaders of most of the bigger parties are already doing their best to put up obstacles.

ECONOMIST: Italy

It finds its way no matter the obstacles people put in its path.

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People with this mindset either throw up their arms and give up when faced with obstacles, or they put things off.

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Researchers at Virginia Tech have found a way to efficiently extract hydrogen from plant materials, overcoming one of the obstacles that led the Obama Administration to put hydrogen fuel-cell technology on the back burner.

FORBES: Could Hydrogen Breakthrough Revive The Fuel-Cell Car?

The Czech Prime Minister, Jiri Paroubek, is also a supporter of the constitution, and is keen to put it to a vote in due course, though he has a number of obstacles to overcome, including passing a law on referendums.

BBC: NEWS | Europe | Treaty woes thwart EU ambitions