A couple of videos via SciBlogs

[marsden_online]

1. Debris flow - a little water, a lot of moving earth.
http://sciblogs.co.nz/crikey-creek/2010/03/20/flash-floods-in-action/

2. The Giotto probe - launched in 1986 to meet Halley's Comet
http://sciblogs.co.nz/terms/2010/03/20/sir-ian-axfords-legacy-the-giotto-probe/