Greatest Inventions

The Englishman. The Irishman and The Scotsman were discussing what was The world's greatest invention.
The Englishman said it was money because it made world trade possible.
The Scotsman said it was The motor car because it made travel so easy.
The Irishman said it was Venetian blinds because if it wasn't for Venetian blinds it would be curtains for all of us.