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"Measurements showed that the setup could transfer energy with 40% efficiency across the gap" (). Right, so to save two metres of cable you would have to be prepared to see a device effectively use 150% extra electricity? The phrase "carbon footprint" really is just a collection of letters to some people, isn't it.
Alex Swanson, Milton Keynes, UK

We shouldn't be too quick to criticise the 22% of adults who don't know that . I know exactly where the ingredients in the sausages I eat come from, but then I buy expensive ones from a high-class butcher. Can we be sure that the cheaper sausages available in supermarkets aren't concocted in some laboratory somewhere out of bits of things that have never been near a farm?
Adam, London, UK

Re . According to today's regulators and bureaucrats, those of us who were kids in the 50s, 60s, 70s and early 80s probably shouldn't have survived, because...
We had no childproof lids on medicine bottles, or latches on doors and cabinets.
When we rode our bikes, we wore no helmets, just flip flops.
We would ride in cars with no seat belts or air bags.
We drank water from the garden hose and not from a bottle - tasted the same.
We ate dripping sandwiches, bread and butter pudding and drank fizzy pop with sugar in it, but we were never overweight because we were always outside playing.
We walked to friend's homes.
We made up games with sticks and tennis balls and ate live stuff, and although we were told it would happen, we did not have very many eyes out, nor did the live stuff stay alive inside us forever.
Our actions were our own. Consequences were expected. This generation has produced some of the best risk-takers and problem-solvers and inventors, ever. The past 50 years have been an explosion of innovation and new ideas. We had freedom, failure, success and responsibility, and we learned how to deal with it all. And you're one of them. Congratulations!
Liz, Perth, Scotland

The final question in 7 days 7 questions was a toughie. Only managed to get it right after long and close study of the accompanying photos. I recognised that Richard Branson's hairstyle dated from the middle of 2004. I pity anyone who was not able to pick up on that clue.
Ralph, Cumbria

If you think the Telegraph's letters are formulaic (Thursday's Paper Monitor), have a look in the London Lite. The idea there seems to be 1) identify celeb-based news story from day before, 2) wrangle this into a comment about how the country has gone up the spout. It's enough to make you want to throw yourself under the Jubilee line at Bond Street.
Ben, London

What on earth have you done to the cap comp photo to make them all look so flat?
Sarah, Edinburgh

Re Paris Hilton's release on . I'm no doctor, but I assume someone has been given a cash injection?
Robin, Edinburgh

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