What makes electricity different? Dumb grids, the ultimate just-in-time problem, and polar bears

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mpeg4
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MPEG-4 Video (360p quality for download)   -   download
File size: 1.04 GB
Width: 480, Height: 360
Duration: 1 hour 16 mins 54 secs
Frame rate: 25.0 fps, Sample rate: 44100 Hz
Average bitrate: 1.84 Mbits/sec
webm
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WebM (360p quality for download)   -   download
File size: 357.57 MB
Width: 480, Height: 360
Duration: 1 hour 16 mins
Frame rate: 25.0 fps, Sample rate: 44100 Hz
Average bitrate: 642.36 kbits/sec
flv
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Flash Video (high quality for streaming)   -   download
File size: 454.70 MB
Width: 480, Height: 360
Duration: 1 hour 17 mins
Frame rate: 25.0 fps, Sample rate: 44100 Hz
Average bitrate: 806.26 kbits/sec
ipod
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iPod Video (high quality for download)   -   download
File size: 285.00 MB
Width: 480, Height: 360
Duration: 1 hour 17 mins
Frame rate: 25.0 fps, Sample rate: 44100 Hz
Average bitrate: 505.35 kbits/sec
mov
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QuickTime (high quality for download)   -   download
File size: 478.68 MB
Width: 384, Height: 288
Duration: 1 hour 17 mins
Frame rate: 25.0 fps, Sample rate: 44100 Hz
Average bitrate: 848.77 kbits/sec
mp3
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MP3 (high quality for download)   -   download
File size: 70.29 MB
Duration: 1 hour 16 mins 46 secs
Sample rate: 44100 Hz
Average bitrate: 125.01 kbits/sec
wmv
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Windows Media Video (high quality for download)   -   download
File size: 269.32 MB
Duration: 1 hour 17 mins
Sample rate: 44100 Hz
Average bitrate: 477.54 kbits/sec