Brian Cox explains quantum mechanics in 60 seconds - BBC News from definition of focus in astronomy Watch Video
Preview(s): Play Video: (Note: The default playback of the video is HD VERSION. If your browser is buffering the video slowly, please play the REGULAR MP4 VERSION or Open The Video below for better experience. Thank you!)
Your browser does not support playing the video.Please download the video!
⏲ Duration: 1 minute 22 seconds 👁 View: 3.7M times
Play Audio:
Your browser does not support the audio tag.Please download the audio.