قنوات يوتيوب مثل Copernicus Center for Interdisciplinary Studies



44,000 2.04%



138,000 1.17%


23,200 3.3%

437,000 3.37%

339,000 2.63%


140,000 3.83%




551,000 4.57%


21,300 1.38%

143,000 2.11%

1,170,000 2.32%