There may be a connection between genes involved in the opioid system and feelings of insecurity in romantic relationships, researchers find.

Children stay in school longer and get married later when their parents love each other, according to research with couples from Nepal.

An optimistic partner may stave off the risk factors leading to Alzheimer's disease, dementia, and cognitive decline as you grow old together.

There's a connection between brief feelings of non-romantic love and better psychological well-being, researchers say.

"When it comes to single people looking for romantic partners, the online dating technology is only a good thing, in my view."

As couples age, they show more humor and tenderness towards one another, researchers say.

Women who are newly in love may have more active genes related to anti-viral defenses, researchers report.

"...altruism is deeply rooted in our evolutionary, neural, and genetic framework."

Animals in love are "basically saying, 'I like you. Let's see where this leads.'"

For happiness in love, don't focus on compatibility. Instead, aim to find someone nice.