• Our report on Icarus Interstellar’s Starship Congress went into a bit of a spin (24 August, p 8). The organisation was founded in 2011; Philip Lubin’s calculations refer to a 100-kilogram, not a 10-kilogram craft; and a radioisotope thermoelectric generator is a power source, not a fuel source.
• As beneficiaries of hindsight, we now see that Mariana Mazzucato proposed that if the beneficiaries of a grant make a certain profit, a contribution will be made back to the benefactors, not the other way around (24 August, p 26).
