I can't hear anything

If you cannot hear anything but you can see the video, please first attempt the following steps:

1. Tap on the screen or hover over the video and click the speaker icon to make sure your audio is not muted.
2. Check your device's volume control to make sure it is not set at zero. 
3. Double-check your device's sound output. 

If you are still experiencing an issue, this could be due to the sound at the source.