4 A good discussion on luminance and how to calculate it can be found on this stack exchange question. ↑
What Makes You Notice a Store’s Sign, or Ignore It? The Answer Makes This Franchise $115 Million a Year.
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The Taliban government says they were "retaliatory operations" - a response after "Pakistani military elements carried out an incursion into Afghan territory, violated Afghan sovereignty, and caused the deaths of several civilians, including women and children".