A new study from the National Bureau of Economic Research contradicts lawmakers who say legalizing medical marijuana encourages more teenagers to use pot. According to the study’s results, there's no indication that pot-friendly states have a higher incidence of high school students trying pot for the first time or regularly getting high.

Researchers compared data from the Centers for Disease Control and Prevention on annual marijuana use by adolescents and found there was no significant increase in the probability that a high school student in states where medical marijuana is legal had used weed in the past 30 days compared to states where it is not.

Ebola is extremely infectious but not extremely contagious. It is infectious, because an infinitesimally small amount can cause illness. Laboratory experiments on nonhuman primates suggest that even a single virus may be enough to trigger a fatal infection. Instead, Ebola could be considered moderately contagious, because the virus is not transmitted through the air. The most contagious diseases, such as measles or influenza, virus particles are airborne.

If you travel to or are in an area affected by an Ebola outbreak, make sure to do the following:Practice careful hygiene. For example, wash your hands with soap and water or an alcohol-based hand sanitizer and avoid contact with blood and body fluids.Do not handle items that may have come in contact with an infected person’s blood or body fluids (such as clothes, bedding, needles, and medical equipment).Avoid funeral or burial rituals that require handling the body of someone who has died from Ebola.Avoid contact with bats and nonhuman primates or blood, fluids, and raw meat prepared from these animals.Avoid hospitals in West Africa where Ebola patients are being treated. The U.S. embassy or consulate is often able to provide advice on facilities.After you return, monitor your health for 21 days and seek medical care immediately if you develop symptoms of Ebola(http://www.cdc.gov/vhf/ebola/symptoms/index.html).

Symptoms of Ebola includeFeverSevere headacheMuscle painWeaknessFatigueDiarrheaVomitingAbdominal (stomach) painUnexplained hemorrhage (bleeding or bruising)

Symptoms may appear anywhere from 2 to 21 days after exposure to Ebola, but the average is 8 to 10 days.Recovery from Ebola depends on good supportive clinical care and the patient’s immune response. People who recover from Ebola infection develop antibodies that last for at least 10 years.