Press shift question mark to access a list of keyboard shortcuts
Keyboard Shortcuts
Shortcuts Open/Close/ or ?
Play/PauseSPACE
Increase Volume↑
Decrease Volume↓
Seek Forward→
Seek Backward←
Captions On/Offc
Fullscreen/Exit Fullscreenf
Mute/Unmutem
Decrease Caption Size-
Increase Caption Size+ or =
Seek %0-9
Copied
Copied
Live
00:00
02:02
02:02
Scientists can now design genetic material called mRNA to help us build immunity to certain viruses, including SARS-CoV-2, the coronavirus that causes Covid-19. Find out how mRNA vaccines work in this video.