• A sweeter cube: mathematician Louis Mordell’s question is whether each integer can be expressed as the sum of the cubes of three integers (23 March, p 16).
• Looking for alignment of black holes’ spins is one way to find out what brings them together; there may be others (30 March, p 13).
• The trial of manipulation of cell surface sugars to help treat cancer is being run by a company called Phytoquest (30 March, p 34).
