The high cost presents a challenge to host nations, especially impoverished ones.
Nobody expects an effective challenge from the host of brave but impotent opposition parties.
The bigger challenge for the rookie host: She's going to spend a lot of time talking about movies most people haven't seen.
Throughout the list, a host of commanding Middle-Eastern women challenge our beliefs about gender and equality in the region.
In a video message that aired on CNN's "Larry King Live, " the talk show host grinned as he accepted Kutcher's challenge.
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And herein lies the challenge for RIM, Facebook and a host of other companies, including Apple.
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To address the challenge of merging environmental and economic goals, Copenhagen will host the Global Green Growth Forum, an annual summit of 200 world leaders, this October.
But the punishing pace of web-based development has also given birth to a host of more flexible methodologies that deal with the real-world challenge of getting a bunch of wayward nerds to collaborate on getting a product out of the door.
Captain Mark Smith, who won a Challenge Cup with Wigan in 2002, was among a host of Vikings ruled out through injury, while Paul Cullen was unable to call on four dual-registration players including Wigan trio Shaun Ainscough, Liam Farrell and Ben Davies.
The Call The Midwife star was told about her first challenge live on Radio 2 on Monday morning by breakfast show host Chris Evans.
The greater challenge to black turnout comes not from apathy, but from the host of voter-ID and voter-registration laws enacted since 2010 that have the effect and arguably the intent of making it more difficult for black Americans to vote.
For the companies that host and distribute that data across the globe, however, it's a large regulatory challenge.
Amlin Challenge Cup champions Cardiff Blues will be seeking revenge for their home defeat last season when they host Edinburgh in their opening game at the Cardiff City Stadium on 4 September.
The Gap App Challenge is the first in a series of challenges that the iZone and New York City will host to maximize the creative energy of the education technology community to bring new approaches to teaching and learning and meet the real needs of students.
WHITEHOUSE: Using Incentive Prizes to Tackle the Middle-School Math Gap | The White House
In addition to finding work (no small challenge) and managing the stresses of marriage and parenthood, some returning soldiers are also coping with a host of health problems including post-traumatic stress, traumatic brain injury and addiction that can potentially increase the risk of suicide.
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