Craig Revel Horwood

Johnny Ball: Hero or Villain?

One, two, three … it shouldn't be that difficult, should it? Certainly not for a master maths mentor. But in rehearsals for the BBC show Strictly Come Dancing last week, Johnny Ball got his sums all wrong as he pulled his partner, the professional dancer Aliona Vilani, in the wrong direction, twisted her leg awkwardly, and left her in hospital with a hairline fracture to her ankle. Maybe it's because they were trying an eight-count tango rather than the "one, two, three" waltz. Maybe it's just that he was determined to get fractions into the show.