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.

Just thinking about your significant other can help keep your blood pressure in check, research shows.

"Sex may set the stage for deepening the emotional connection between strangers."