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First COVID-19 Vaccine – level 1
17-08-2020 07:00
Russia makes a COVID-19 vaccine. A vaccine is a...Balloons at Airport – level 2
30-07-2020 07:00
Many planes around the world stopped flying because of...Green Card Lottery – level 3
28-07-2020 07:00
Every year, millions of people around the world apply...