You can supply a map to agg, something like {col1:'sum', col2: 'mean',...}

Yes, but it is still applying that function to a single column (the summarise example I gave could aggregate multiple columns into a single result, e.g. sum(col1 / col2))

Of course, Trump has an offshore wind array in his view from his hold course in Aberdeen. So he may have ulterior motives than bird preservation here.

'burner' in the parent comment refers to a disposable pre-paid phone without contract.

You're describing a kind of 'tell' I think. Still an interesting point you make.

He was talking about burners being used to be seemingly undetectable, which got me thinking about people with nearly imperceptible tells, and how both of these "nearly invisible" things are seen by big brother. You are right though... it's a very questionable segue.