NBC News Testosterone Gel Didn't Help Men's Memories 2017-02-21T20:11:24.000000Z Testosterone treatment did not improve older men's memory or mental function, researchers said Tuesday. Doctors Test Vaccine Against Mosquito Spit 2017-02-21T20:05:37.000000Z The NIH has started testing a vaccine designed to protect against all diseases spread by mosquitoes, from Zika to malaria and yellow fever. David Cassidy Reveals Dementia, Saying He 'Always Knew This Was Coming' 2017-02-21T18:47:22.000000Z The onetime star of "The Partridge Family" reportedly struggled to remember the lyrics to songs during a weekend concert in California. Teen Suicide Attempts Fell as Same-Sex Marriage Became Legal 2017-02-21T13:38:00.000000Z Teen suicide attempts in the U.S. declined after same-sex marriage became legal and the biggest impact was among gay, lesbian and bisexual kids, a study found. Couple Celebrates Twin Pregnancy After Fertility Struggle: 'We prayed for 953 days' 2017-02-20T10:40:00.000000Z The couple, who were high school sweethearts, live outside of Houston in The Woodlands, Texas. They learned about their fertility problems shortly after they started trying to have a family in 2014. What 'This Is Us' Got Right About Panic Attacks 2017-02-17T20:12:00.000000Z This week's episode of 'This Is Us' highlighted an important topic: panic attacks. And it got viewers talking. Doctors Can Ask Patients About Guns: Federal Court 2017-02-17T12:45:00.000000Z A federal appeals court has ruled that Florida doctors can talk to patients about gun safety, declaring a NRA-supported law aimed at restricting such discussions to be a violation of the First Amendment's right to free speech. Two Women Positive for Zika After False Negatives in D.C. 2017-02-16T22:01:00.000000Z The CDC is retesting 409 specimens that tested negative in Washington, D.C., last year, and so far two have already come back positive. Flu Vaccine Protects Only About Half, CDC Says 2017-02-16T20:00:00.000000Z The CDC says the current flu vaccine protects only about half of people from infection. Stop Calling Trump Mentally Ill, Psychiatrist Says 2017-02-16T17:59:00.000000Z It's not a personality disorder if you just landed the most important job in the world, one psychiatrist points out. He should know. He wrote the book.