And cardboard is no exception as gardening experts have revealed five ingenious ways of using this disposable material for good in the garden, from getting rid of weeds to enriching soil.

Spiv made a ducting out of a twix box before, and it worked fine. I'll try to dig up some pix. I think you're safe - but i'd watch it for a few minutes before i went walking away - just to be safe ...

Using a cereal box, cardboard, foil, paper, scissors and tape or glue, you can put together this projection eclipse viewer. As always, NASA advises not to look directly into the sun using this tool.