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Toddlers seem to know the difference between a whiner and somebody who is justifiably upset, and the young children often show less sympathy for crybabies, a new study shows.

Declining rates of circumcision among infants will translate into billions of dollars of unnecessary medical costs in the U.S. as these boys grow up and become sexually active men, researchers at Johns Hopkins University warned.

A new report on teen sex contradicts a popular notion that teens are turning to oral sex as a way to delay “real” intercourse.

Japanese researchers have found very low amounts of radioactivity in the bodies of about 10,000 people who lived near the Fukushima Daiichi power plant when it melted down. The first published study that measured the radiation within a large number of residents reassured health experts because the numbers reported imply only negligible health risks. The threat appeared to be considerably lower than in the aftermath of the Chernobyl accident, the experts agreed.

The CDC says there is only one good treatment left to ward off the sexually transmitted disease gonorrhea. Lab studies are showing an increasing resistance to the type of drugs that doctors use to treat gonorrhea, called cephalosporins. That leaves only a few options, which are not as effective. “Cephalosporin-resistant gonorrhea could potentially mean untreatable gonorrhea,” says Dr. Gail Bolan, director of the Division of STD Prevention at the CDC. “Untreatable gonorrhea is a real possibility.”

HPV is a sexually transmitted disease that is most commonly passed between people during vaginal or anal intercourse. But it can also be transmitted through genital-to-genital, or hand-to-genital contact, which is how the participants in the study likely got the virus, the researchers said. Out of the more than 40 sexually transmitted HPV strains, more than a dozen have been identified as cancer-causing, according to the National Cancer Institute.

Led by NASA’s James E. Hansen, the study said it was nearly certain that events like the 2011 Texas heat wave were caused by the human release of greenhouse gases.

Changing the type of DVDs, videos and TV shows that preschoolers watch during the day may help them sleep better at night. A program that encouraged parents of kids ages 3 to 5 to replace age-inappropriate media content with more suitable programming found "long-lasting, significant reductions in sleep problems," says Michelle Garrison of Seattle Children's Research Institute, lead author of the study in Monday's Pediatrics.

How can a cancer come back after it’s apparently been eradicated? Three new studies are bolstering a long-debated idea: that tumors contain their own pool of stem cells that can multiply and keep fueling the cancer, seeding regrowth.

Republican U.S. presidential challenger Mitt Romney's proposal to slash income taxes by 20 percent across the board would boost income for the wealthiest taxpayers while reducing it for the middle class, according to a nonpartisan analysis released on Wednesday.