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    $\begingroup$ Since this is aimed at mid-level new users, it might be useful to point out that when Apply is used on a list of lists, List itself is a head and that {...} is just shorthand. I think people often overlook until the first time they're really confronted with it, like this. +1 $\endgroup$ Commented Aug 6, 2015 at 15:16
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    $\begingroup$ @N.J.Evans valid point. Expanded. $\endgroup$ Commented Aug 6, 2015 at 15:20
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    $\begingroup$ …and for the kids at home, FullForm[] will help you in playing "spot the difference". :) $\endgroup$ Commented Aug 6, 2015 at 15:21
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    $\begingroup$ @rcollyer So You are AtomQ! I was looking for you! :D $\endgroup$ Commented Aug 6, 2015 at 15:26
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    $\begingroup$ @Guesswhoitis. no, he's on First. $\endgroup$ Commented Aug 6, 2015 at 15:55