“Oh dear, back to the drawing board,” sighed Brian. “What would be the use of it?” asked Rishaan. “Well I was thinking it might be useful for old people and pregnant women. I doubt if an able-bodied man would want to be seen using one. I’m hoping the technology I’ve created would then be applied to another invention of mine, the transportable telephone. A telephone without a wire with which one can roam the streets, deep in conversation,” said Brian. “Why would anyone want one of those? Sounds dangerous; besides, there are telephone boxes everywhere,” said Rishaan. “It would be useful for policemen and pregnant women,” concluded Brian. “If I had a bun in the oven I wouldn’t want one of them things on my lap,” declared Sam. “Yes, well, it’s still all experimental. Tell me, Rishaan, ha

