ट्रेन की छत पर ये गोले क्यों होते हैं | What is the roof ventilator | most amazing facts #factsbr br in this video we tell most amazing facts about tain and science | What is the roof ventilator || most amazing factsbr #Factsbr #interestingfactsbr #amazingfacts br #randomfacts br #amazingfactsbr br 1. This video has no negative impact on the original works (It would actually be positive for them) 2. This video is also for teaching purposes.br br 3. It is not transformative in nature.br br 4. I only used bits and pieces of videos to get the point across where necessary.br br We do NOT own the video materials and all credits belong to respectful owner. In case of copyright issues, please contact us immediately for further credit or clip delete.br br Disclaimerbr br Under Section 107 of the Copyright Act 1976,br allowance is made for "fair use" for purposes suchbr as criticism, commenting, news reporting, teaching, scholarship, and research. Fair use is a use permitted by copyright statute that might otherwise be infringing. Non-profit, educational or personal use tips the balance in favour of fair use.