21.   A reader wrote that he was told a billion means a thousand million in the United States but that in the United Kingdom, it means a million million.

22.   A reader wrote the New York Times that she already had a genetically altered cat in her household.

23.   A reader wrote the statement, but your account balance is the only detail that must, by law, be included.

24.   A reader wrote to say that he had misplaced one of his favorite recipes for entertaining.

25.   A reader wrote to say that he had transformed a dead oak into his version of Tweetville, and he sent the magazine a photograph.

26.   Actually, a reader wrote about his door.

27.   But other readers wrote that spammers can steal your address book and send out spam e-mail to your friends, relatives and colleagues from your computer.

28.   But others have gained ground, and one hot trend has been to include racy letters supposedly written by readers.

29.   But The San Jose Mercury News turns most of a weekly features section, Celebrations, over to heart-warming articles written by readers.

30.   Each casualty is a shock and readers write in protest.