Film-maker Steven Spielberg did it. Nobel laureates Thomas Suedhof and Shinya Yamanaka did it. The fashion world's Naomi Campbell and Victoria Beckham did it. Physicist Stephen Hawking - who has the disease amyotrophic lateral sclerosis (ALS) -watched as his children did it on his behalf. They, perhaps you, and millions of others all took the 'ice-bucket challenge'. Even if the name is unfamiliar, the images are unlikely to be. The challenge involved being filmed as you had a bucket of iced water thrown on you. For the privilege, most people pledged money for research into ALS, also known as motor-neuron disease, and then nominated others to take the challenge. The resulting little movies were posted on the Internet. It was a lot of fun.
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