11.   Russian engineers were not immediately certain what was causing the noise in the spacesuits.

12.   Witnesses reported hearing and seeing an engine fall off, and investigators suggested the noise was caused by a catastrophic mechanical failure.

13.   Windows shook, but there was no immediate way of establishing whether the noise was caused by a sonic boom of NATO jets or an actual hit.

14.   The new runway has caused unprecedented noise over several suburbs and set fresh flight paths across large swathes of Sydney previously unaffected by aircraft noise.