Comments about #12421

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h: why not hospital drama? (2 days, 4 hours ago)

AJ: As others have said, needs to be square root of -1. Otherwise great quiz. (2 weeks, 4 days ago)

Frantic: Was marked wrong for 24 for some reason. Good variety. (3 weeks, 2 days ago)

Colm: -1 is not i; liked the last group - kicking myself that I missed it (3 weeks, 2 days ago)

Nick H: unfortunately, the number -1 is NOT known as/abbreviated to 'i'. i is the SQUARE ROOT of -1, hence an 'impossible number', (i for impossible!). Other than that, nice grid (3 weeks, 5 days ago)

Nellington: Very enjoyable grid. Nice work! (3 weeks, 5 days ago)