Letter on my favourite new blog (my only news blog!)
“I’m currently doing a science project with one of my home-educated boys and need some information. If you know the answer to the following question or a place I can find it, let me know. A thermos flask works by using a vacuum to prevent heat leaving the liquid. But, if heat can’t travel across a vacuum, how does the sun heat Earth?
Martin, Stevenage, UK”
Hurrah for home educators 😆