imagesize:widthxheight (in pixels)  imagesize:500x400 
range... camera $400, $50..$100
"words" exact match
OR ... combine  "this" OR "that"
~word putting the ‘~’ similar words
-word omit word
*wild card 
@twitter, #throwbackthursday, site:youtube.com or site:.gov. cache:
related:time.com. cache:time.com.
define:word
[number]