Bill Gates looks to new toilets to improve world sanitation
Bill Gates is, in a manner of speaking, flushing his money down the toilet.
His charitable organisation, the Bill & Melinda Gates Foundation, is looking for future loos that can improve sanitation around the world.
At the Reinvent the Toilet fair, hosted at the foundation's Seattle campus this week, designs included a lavatory that used microwave energy to turn excrement into electricity.
The BBC's Alastair Leithead was there.
16 Aug 2012