Fractures

From time to time, one of you turns up at school in a cast. I wonder if you have a clear picture of just what happens if it is a bone that you have fractured. Here are a couple of videos that show different ways in which bones break.

Fractures video 1

Fractures video 2

The Inner Life of a Cell

It's not new, but it's quite stunning.

Look at this animated video of the inner structure and processes within a cell. Specifically, the response of a White Blood Cell to an inflammatory agent.

There's another version of this with a commentary explaining the processes and structures involved.

And here's the transcript, by someone who seems to understand this better than I do.

The first mechanical computer?

They call it the world's first mechanical computer. It was created some 2000 years ago. And some months ago, somebody built a working model, based on the original. Read about the Antikythera mechanism.

Water, water everywhere

While we search for water on Mars, having sent spacecraft and landers there to do our searching, we're managing to find the stuff up to 11 billion light years away. Here's how and where.