Prof John

@johncastillo

Science & Technology

202

Video Count

46.5M

Video View

96.3K

Subscriber

#3,444

Canada Rank

#144,600

Global Rank

202

Video Count

46.5M

Video View

96.3K

Subscriber

#3,444

Canada Rank

#144,600

Global Rank

Timeline Explorer

Channel Evolution

Journey through Prof John's most significant moments, from humble beginnings to major achievements.

Years

Milestones

Years Active

2012

Channel Launch

Prof John started the YouTube journey

Feb 17, 2012

Journey begins

Channel foundation

1K Milestone

Subscriber community reached 1K members

Apr 11, 2012

1K subscribers

Major milestone

Estimated date — Based on linear growth calculation. Not actual historical data.

2013

10K Milestone

Subscriber community reached 10K members

Aug 12, 2013

10K subscribers

Major milestone

Estimated date — Based on linear growth calculation. Not actual historical data.

2019

50K Milestone

Subscriber community reached 50K members

Jul 18, 2019

50K subscribers

Major milestone

Estimated date — Based on linear growth calculation. Not actual historical data.

2025

Viral Hit

Why Playstation doesn’t use ABXY #gaming #controll...

10 months ago

3.9M views

#1 top video

Viral Hit

What’s the difference between QR and barcode? #qrc...

9 months ago

3.5M views

#2 top video

Subscriber Milestones

Viral Moments

Feb 17, 2012

Journey Started

Prof John

Channel Evolution

Channel Launch

1K Milestone

10K Milestone

50K Milestone

Viral Hit

Popular Video

Viral Hit

Channel Evolution

Channel Launch

1K Milestone

10K Milestone

50K Milestone

Viral Hit

Popular Video

Viral Hit