Everyone is doing the ALS ice bucket challenge. But while the awareness of the disease is being spread, many don't really know what it is about.

From Justin Timberlake:

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To Robert Downey Jr.

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Mark Zuckerberg:

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Even Justin Bieber:

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But ALS is more about the ice bucket challenge. It is more famously known as Lou Gehrig's disease.

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The ability to speak, swallow and breathe are also affected.

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Learn more about it from this video:


Don't just do the challenge. Know what it really is about too.