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The ALS ice bucket challenge has raised an unprecedented £48 million in less than a month in a flood of donations from more than 1.7 million people.
Britney Spears, Lady Gaga, Mark Zuckerberg and even George W. Bush are among the famous faces that have drenched themselves in freezing water for a good cause.
Anyone accepting the challenge is urged to share a video of the event and nominate someone else to do the same, making a donation to any charity supporting Amyotrophic lateral sclerosis.
ALS is the American name for the condition usually referred to as motor neurone disease (MND) in the UK, where the leading organisation is the Motor Neurone Disease Association.
The disease affects the brain and the spinal cord causing motor neurones to degenerate and die, leading to gradual paralysis and eventually death.
In pictures: The famous do the ice bucket challenge
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There is no known cure, although the millions being raised by the ALS Association in the US and other charities will go towards vital research.
Anyone wanting to donate to the cause or raise awareness of the disease does not have to do the ice bucket challenge.
The US ALS Association is accepting donations here and people wanting to help can also host their own fundraiser, a sponsored event or even give their car to the organisation.
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