When is the News Week?
Appeared in Volume 8/3, August 1995
The November 29, 1993 issue of Newsweek contains an interesting article
entitled "Doin' What Doesn't Come Naturally," and subtitled "Is the brain not
built to do physics?" The article suggests that "abstract logic escapes all but
a select few," and goes on to suggest that "few students, or adults for that
matter, master two other aspects of formal thought - noncontradiction and
impossibility." "Without them," the article says, "you cannot solve the
long-lost-sister puzzle."
Here's the long-lost-sister puzzle as stated in Newsweek:
"I am your long-lost sister," says Amy to the man, who indeed has one (but only
one) missing sibling. "She's lying - I'M your long-lost sister," Barbara
insists at the family reunion. "At least two of us always lie," smirks a third
woman, Carol.
Which one is the man's sister?
