Here's a direct link for you.
Dispatches from the Dirt Lab #2: Building Better Sandcastles from Matt Kuchta on Vimeo.
The idea of reinforcing sandcastles occurred to me while I was teaching about "geotextiles." These materials are used to add strength to soils for geo-engineering projects like roads, embankments, and retaining walls.
And I have a question sent to me by a visitor. It involves robots, basements, and digging. I'm looking forward to putting an answer together.
UPDATE: The video has been picked up by a few people - and while I try not to read comments on big aggregator sites, a few people have made some good suggestions: