"There are a few reasons it's important to be aware of how much time in daylight you're getting," Cheung explains. "For adults, research shows that spending around 20 minutes outdoors every day has both physical and mental health benefits, including providing essential vitamin D and even boosting your mood."

Apple's plan to bring blood-pressure tracking to the Apple Watch is still hitting snags, according to Bloomberg's Mark Gurman. Writing

An Apple Watch with a camera could be used to give the best-selling wearable series visual intelligence, and let it interact with the world around you.