Chinese Activist Vacuums Beijing’s Air For 100 Days Then Makes A Brick With The Pollution, page-4

Must be the most expensive clay brick ever made.

4 kW industrial strength vacuum cleaner operated for 400 hours - 1,600 kWh. Average electricity price in Beijing about US$0.13 per kWh. Cost to collect "dust and smog" raw materials for 1 brick = US$208!

Maybe the Nut Man should sell these bricks to Trump for his silly wall.

I realise I've totally missed the point of this silly exercise but I'm bored - apologies. Back to the cave. Cheers.