• Hot water bears: the highest temperature to which experimenters exposed Antarctic tardigrades was 41°C (6 January, p 19).
• Stratollite surveillance balloons fly only filled with helium (27 January, p 8).
• The maximum thermal efficiency of a petrol or gasoline car engine is 35 per cent and that of a diesel car about 45 per cent (20 January, p 36).
• Harris County in Texas is closer to Louisiana than to Mexico, and there have been no judicial executions in Iowa since 1965 (20 January, p 10).
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