Was it Dateline's Stone Phillips or A&E's Bill Kurtis who first perfected that trademark head movement? You know the one ... pause, glance at the floor, take a breath, look up and continue talking, meant to convey an additional air of gravity and/or sincerity. Steepling of fingertips optional.
Whoever came up with it first, Bob Robertson has got it down pat. Eerily so.
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