• We mistakenly illustrated a story about “pointillist graphics” for computers (3 April, p 18) with a standard polygon image; had it been pointillist it would have been less blocky.
• The physicist Eugene Wigner was Hungarian, not German (10 April, p 28). He studied in Germany until 1930 and became a US citizen in 1937.
• We misspelled Kerri Moloughney’s surname in our article on aerial detection of grave sites (10 April, p 18).
• The statement “Shakespeare’s prose would have a higher entropy than Egyptian hieroglyphs or Morse code” had low information content (10 April, p 11). Shakespeare coded in Morse and in Roman script would have the same entropy, higher than that of, say, a laundry list, as it is less predictable and less “ordered”.
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