Here are some of the most interesting science news articles I read this week:
Neanderthals may have been infected by diseases carried out of Africa by humans, say researchers
Children of older mothers do better (good news for my son)
Why do people with Alzheimer's stop recognizing their loved ones?
Zika virus may now be tied to another brain disease
Millions of maternal and child lives could be saved every year for less than $5 per person
Friends or not? Just a second of laughter can reveal relationship status
Spreading seeds by human migration
Why relationships fail, according to science
Our universe is expanding a lot faster than we thought
Scientists have constructed a single-atom engine
This algae-based water bottle degrades when it's empty
Have a good weekend, and I'll see you Monday!