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Focuses on sleep research and the learning potential of sleep. Finding that getting more sleep helps students do better in school; Role of the sleeping brain in solidifying memories and processing newly learned lessons; Views of sleep researchers; Findings of sleep studies; Diseases connected to sleep deprivation; How those most at risk for heart problems due to bad sleep are people with apnea; Use of the body's sleep-wake clock by cancer researchers. INSET: HOW TO GET A GOOD SLEEP.

Focuses on cloning, the outlook for human cloning, and "therapeutic cloning". The view of Shin Yong Moon of Seoul National University about reproductive cloning; Timeline on cloning from the July 1996 birth of the sheep, Dolly, to February 2004 when a South Korean group reveals they have cloned human embryos; Concern about regulating the procedure; The limited ban on human cloning in South Korea; Details of the research led by Woo Suk Hwang in South Korea, which extracted stem cells from a cloned embryo; Discussion of why the Korean team was successful; Benefits of cloning research; The role of Jose Cibelli, a cloning expert at Michigan State University, in the Korean study; The ban on this kind of embryo research in the United States; Concern that Hwang's embryos will be put in a woman's womb; Comments from various researchers.

Discusses how doctors can help families affected by hereditary diseases conceive a healthy child by genetically screening embryos. Use of blood from the new child's umbilical cord to provide life-saving cells for a sick sibling; How use of an aborted fetus is illegal as a source of tissue; Curing power of stem cells from matched siblings; Concern from lawmakers that women may get pregnant with the intention of aborting their fetuses to obtain transplant tissue for sick relatives; Ethics of the transplantations.

Discusses how physicist Erwin Schr&oumldinger made important discoveries with regard to understanding deoxyribonucleic acid (DNA). How scientists James Watson and Francis Crick worked out the structure of the double helix; Complexity of the structure of DNA; Speculation from scientists about how DNA evolved from ribonucleic acid (RNA); Consideration of how the U.S. National Aeronautics and Space Administration (NASA) sponsors different types of DNA research. INSETS: DNA'S TWISTS OF HISTORY;HOME-BREWED DNA.

Report on increased cases of West Nile Virus and other, more-dangerous insect-carried diseases in the United States. Increase in the number of insect sprays and repellent candles being sold; Suggestions for how to prevent insect bites and associated diseases; Importance of DEET in combating insect bites.

Comments on the debate surrounding the cloning of pets, following the creation of a cloned cat named cc by Advanced Cell Technology (ACT). Potential that so-called designer pets could tap into a huge market; Moral and ethical questions surrounding cloned pets; Companies involved in cloning, including Lazaron BioTechnologies and Genetic Savings & Clone; Scientists involved, including Richard Denniston, who cofounded Lazaron.

Discusses biotechnology companies in the United States. Details on investment in several biotechnology companies; Genentech, a company that has developed Rituxan, a treatment for lymphoma; Amgen, the industry's largest company, which has developed the arthritis drug Kineret; Decision to buy Immunex.

Reports on fears of anthrax exposure and infection in the United States following the mailing of letters containing anthrax to various locations. Preparedness of the public-health system in the United States for a biological weapons attack; Views from the U.S. Centers for Disease Control Director Jeffrey Koplan; Prevention, symptoms and treatment detailed for likely bioterrorist agents such as anthrax, botulism, plague, and smallpox.

Reports on fears of anthrax in the United States. The effect of government warnings concerning bioterrorism and biological weapons preparedness on the public consciousness; Fear and hysteria concerning instances of anthrax exposure to major public figures; View that terrorists behind the anthrax delivery have succeeded in their goal to create fear.

Reports on bioterrorism in the United States. Envelopes containing white power sent to a Microsoft office in Reno, Nevada, National Broadcasting Co. Inc.'s offices in New York, and to American Media Inc. in Boca Raton, Florida; Difficulties in launching biological terrorism attacks. INSET: A once and future scourge.

Focuses on the efforts of New York City firefighters and others to find survivors of the terrorist attack on the World Trade Center. Number of firefighters who have died in the building's collapse; How the firefighters have become heroes; Courage of those helping others to escape from the building; Loss of Reverend Mychal Judge, a fire department chaplain; Details of acts of bravery at the Pentagon in Washington D.C., which was also hit by a hijacked airplane. INSET: A grim search for the lost, by Stacey Schultz and Nancy Shute.