What Is Time? | Professor Sean Carroll explains the theories of Presentism and Eternalism

 https://www.youtube.com/watch?v=MAScJvxCy2Y

Lee Smolin - How Can Space and Time be the Same Thing? https://www.youtube.com/watch?v=QOAcQCFNtbo

Neil deGrasse Tyson Explains Time Dilation https://www.youtube.com/watch?v=1BCkSYQ0NRQ

General Relativity Explained simply & visually https://www.youtube.com/watch?v=tzQC3uYL67U