Nice sites to track COVID-19 trends

 

Interstate restriction

https://ballotpedia.org/Travel_restrictions_issued_by_states_in_response_to_the_coronavirus_(COVID-19)_pandemic,_2020

Visualization COVID-19 trend, averaged by population.

https://91-divoc.com/pages/covid-visualization/

Nice up to date data on COVID-19 and visualization

https://coronavirus.1point3acres.com/

Websites

Perl
Perl CGI SYNOPSIS
Samples - CGI.pm - a Perl5 CGI Library
Perl中文手册
CGI - perldoc


R
STAT - Power Test