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Url changed from http://www.nytimes.com/video/science/100000002906469/collidi..., which points to this. In general HN prefers text to video.

I see, thank you. I'm sorry that I forgot to put "[video]" in the original title too, but of course that doesn't matter anymore.

The original link suits me better, as I've hit the article limit. The video link works fine.