Now Playing: Sleep loss can make people more isolated and lonely: Study
Now Playing: FDA approves marketing for a contraception app for the 1st time
Now Playing: Young children talking back and forth with adults strengthens brain language region
Now Playing: Boxers or briefs? Largest-ever study shows boxers may beat briefs for baby-making
Now Playing: Living in the city may not be heart healthy: Study

vCard.red is a free platform for creating a mobile-friendly digital business cards. You can easily create a vCard and generate a QR code for it, allowing others to scan and save your contact details instantly.
The platform allows you to display contact information, social media links, services, and products all in one shareable link. Optional features include appointment scheduling, WhatsApp-based storefronts, media galleries, and custom design options.
Now Playing: Opioids after wisdom teeth removal might set young people up for addiction
Now Playing: Low-calorie diets affect men’s and women’s bodies differently, study shows
Now Playing: Lung cancer deaths among women expected to increase worldwide: Study
Now Playing: Could soccer ‘heading’ lead to greater brain injury for women than men?
Now Playing: Alcohol-based hand sanitizers: can they backfire?
Now Playing: What is Parkinson’s disease?
Now Playing: Secondhand smoke more dangerous for teens: Study
Now Playing: What are the benefits of breastfeeding?
Now Playing: What is Cave disease?
Now Playing: Trauma suffered in childhood echoes across generations, study finds
Now Playing: Overtime work may overdrive diabetes risk in women
Now Playing: Eat dinner earlier, dodge cancer?
Now Playing: Expired sunscreen alert
Now Playing: What is hand, foot and mouth disease?
Now Playing: World’s 1st test-tube baby celebrates 40th birthday