قنوات يوتيوب مثل Professor David S. Ricketts


160,000 4.1%

11,200 2.76%


17,800 2.57%

157,000 2.62%


240,000 1.41%

928,000 3.57%

416,000 4.69%

10,500,000 3.02%

4,070,000 2.84%

46,300 1.06%


17,400 1.98%


23,100 2.6%

87,100 1.8%

69,800 1.71%

240,000 1.46%

100,000 3.17%


33,800 1.96%

3,390,000 1.13%

28,400 2.96%

12,800 2.12%