Letter: For the record

• We got our wires crossed when describing a technique to repair damaged nerves (10 May, p 14). The alloy used contains gallium, indium and tin.

• An elementary error appeared in our feature on the H-bomb curve (7 June, p 42). Carbon-14 decays to nitrogen-14.

• In our story on European migration, we gave a little too much latitude to the labels on the accompanying map (14 June, p 14).

• The act of measuring out David Mermin’s letter on quantum Bayesianism changed its meaning (7 June, p 30). It appears online in full (bit.ly/FTR_qb)