Addiction

A synthetic opioid that hits up to 10 times harder than fentanyl is rapidly emerging global health threat, having been officially tied to more than 40 fatal overdoses over the past two years in the US alone. Here's what you need to know.

For the first time, scientists find that the male brain is wired to motivate men to drink when they're lonely, while the opposite appears true when it comes to women. It highlights how sex-specific neural pathways inform our behaviors.

Much in the same way humans can become addicted to online gaming or internet gambling, dogs can become addicted to their toys. That's the finding of new research that examined the behaviors of 105 pups in a laboratory setting.