What is hydrodynamics ?

array(10) { [0]=> object(stdClass)#4608 (5) { ["video_id"]=> int(9999999) ["related_video_id"]=> string(11) "hFx9YT1rMpU" ["related_video_title"]=> string(22) "What is aerodynamics ?" ["posted_time"]=> string(28) "11 месяцев назад" ["channelName"]=> string(8) "Sciwords" } [1]=> object(stdClass)#4581 (5) { ["video_id"]=> int(9999999) ["related_video_id"]=> string(11) "6zeHWVUiXoc" ["related_video_title"]=> string(36) "The Hydrostatic Paradox - Explained!" ["posted_time"]=> string(19) "8 лет назад" ["channelName"]=> string(12) "Physics4Life" } [2]=> object(stdClass)#4606 (5) { ["video_id"]=> int(9999999) ["related_video_id"]=> string(11) "k6JOXbMu0WI" ["related_video_title"]=> string(159) "Нежная музыка, успокаивает нервную систему и радует душу 🌸 целебная музыка для сердца" ["posted_time"]=> string(0) "" ["channelName"]=> string(15) "Relax Your Soul" } [3]=> object(stdClass)#4613 (5) { ["video_id"]=> int(9999999) ["related_video_id"]=> string(11) "jQHp49OyPn8" ["related_video_title"]=> string(58) "WHAT IS CFD: Introduction to Computational Fluid Dynamics" ["posted_time"]=> string(19) "6 лет назад" ["channelName"]=> string(23) "DMS | Marine Consultant" } [4]=> object(stdClass)#4592 (5) { ["video_id"]=> int(9999999) ["related_video_id"]=> string(11) "lvM8DpYhFbo" ["related_video_title"]=> string(184) "Музыка лечит сердце и сосуды🌸 Успокаивающая музыка восстанавливает нервную систему,расслабляющая" ["posted_time"]=> string(0) "" ["channelName"]=> string(15) "Yellow Melodies" } [5]=> object(stdClass)#4610 (5) { ["video_id"]=> int(9999999) ["related_video_id"]=> string(11) "P_jQ1B9UwpU" ["related_video_title"]=> string(78) "Viscosity, Cohesive and Adhesive Forces, Surface Tension, and Capillary Action" ["posted_time"]=> string(19) "6 лет назад" ["channelName"]=> string(23) "Professor Dave Explains" } [6]=> object(stdClass)#4605 (5) { ["video_id"]=> int(9999999) ["related_video_id"]=> string(11) "DW4rItB20h4" ["related_video_title"]=> string(34) "Understanding Bernoulli's Equation" ["posted_time"]=> string(21) "4 года назад" ["channelName"]=> string(22) "The Efficient Engineer" } [7]=> object(stdClass)#4615 (5) { ["video_id"]=> int(9999999) ["related_video_id"]=> string(11) "VvDJyhYSJv8" ["related_video_title"]=> string(23) "Understanding Viscosity" ["posted_time"]=> string(21) "4 года назад" ["channelName"]=> string(22) "The Efficient Engineer" } [8]=> object(stdClass)#4591 (5) { ["video_id"]=> int(9999999) ["related_video_id"]=> string(11) "pHwRrE14cjE" ["related_video_title"]=> string(34) "1940's Jazz Bar - Vintage Classics" ["posted_time"]=> string(23) "1 месяц назад" ["channelName"]=> string(11) "barely jazz" } [9]=> object(stdClass)#4609 (5) { ["video_id"]=> int(9999999) ["related_video_id"]=> string(11) "iyrnPNBWIQ4" ["related_video_title"]=> string(161) "«Жить надо сегодня». Олег Тиньков и Майкл Калви о взлете нового финтех-стартапа Plata" ["posted_time"]=> string(19) "4 дня назад" ["channelName"]=> string(28) "Это Осетинская!" } }