- https://countingdownto.com/
- https://conversionxl.com/blog/creating-urgency/
- https://www.nasa.gov/mission_pages/launch/countdown101_prt.htm
- https://www.newsweek.com/president-trump-countdown-clock-showing-days-until-his-term-ends-goes-viral-1007945
- https://www.instagram.com/trump_counter/
- http://ultimateclassicrock.com/tom-petty-countdown-clock/
- http://en.wikipedia.org/wiki/Same-origin_policy
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