It took 20 years and $1.5 billion to develop a vaccine for dengue, a deadly mosquito-borne virus. After it finally got approval in many countries, a complication has surfaced.
Teens say they like the JUUL e-cigarette because it's sleeker than other devices and teachers don't notice it. But researchers say teenagers who vape are more likely to move on to cigarettes.
Funding for the Children's Health Insurance Program expired in September. Millions of children could lose coverage, unless Congress acts soon to restore the money to keep the program running.
The tax changes proposed by Republican lawmakers would impact President Trump's personal finances. This week, he said: "This is going to cost me a fortune," but experts say that's far from the case.
The Republican tax plan could reduce or eliminate federal tax credits that reward companies for developing drugs to treat rare diseases. People who benefit from the medicines have objected.
After decades of hope and disappointment, doctors have now been able to treat several different types of genetic conditions by giving each patient a healthy version of their defective gene.
Many videos on the site feature popular characters in upsetting and violent situations, and some videos of children have attracted pedophilic comments. YouTube says it is toughening its approach.