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Scientists say they have recovered functioning stem cells from amniotic fluid—the liquid that surrounds a baby in the womb. The most useful types of stem cell have so far been derived from specially grown human embryos, but this has created ethical concerns because the embryos are destroyed in the process. Supporters say stem cells offer hope in treating illnesses like diabetes, Parkinson's and Alzheimer's.

DEFINITION: (noun) A person who shows no gratitude. SYNONYMS: thankless wretch, ungrateful person. USAGE: This bird was a godsend to us, and I should be an ingrate if I forgot to make honorable mention of him in these pages.

Hawking, one of the world's leading theoretical physicists, is famous for having provided mathematical support for the big-bang theory of the origin of the universe. He continues to work and teach, despite being severely disabled by amyotrophic lateral sclerosis (ALS), which confines him to a wheelchair and forces him to use a computer-generated voice synthesizer to communicate. He is the Lucasian Professor of Mathematics at Cambridge University; what other famous scientists have held this post?

Lotario de' Conti became Pope of the Catholic Church in 1198 at the age of 37, taking the name "Innocent III." He set out immediately after his election to realize his ideal of the pope as ecclesiastical ruler of the world with some secular political power. Among other activities, Innocent III called for the Fourth Crusade, which went awry. What did the crusaders do instead of going to the Holy Land?

It is a good rule in life never to apologize. The right sort of people do not want apologies, and the wrong sort take a mean advantage of them.

Abu Dhabi is the largest of the 7 seven emirates that make up the United Arab Emirates (UAE). The capital, also named Abu Dhabi, is the second largest city in the UAE and served as the provisional capital when the UAE was formed in 1971. Up until the discovery of oil there in the late 1950s, the economy of Abu Dhabi was sustained mainly by camel herding, fishing, and pearl diving. Who is the hereditary emir and ruler of Abu Dhabi?