Films and TV programmes have long portrayed caveman as using grunts to communicate with one another. But a new study suggests that our ancient ancestors likely did not use sounds to communicate, and instead opted for hand gestures. Researchers from the University of Western Australia asked volunteers to attempt to describe words using only grunts or gestures. They found that gestures were far more effective in communicating meaning and were often similar between cultures. 'The universality of gesture means it is ideally suited to bootstrapping human communication among modern humans and therefore supports the hypothesis that gesture is the primary modality for language creation,' the researchers said in their study, published in Proceedings of the Royal Society B. Films and TV programmes have long portrayed caveman as using grunts to communicate with one another. Searching for a way to make your point?

In June, Amazon announced it was close to being able to offer for package deliveries by drone for its Prime Air service. That same month, Uber said it plans to test food delivery by aerial drone in crowded cities. And drone delivery company Flytrex already touts the ability to deliver drinks via unmanned vehicle on the golf course. Despite such announcements, drones are not crowding the skies over major cities and population centers just yet. But that may be about to change.

For island nations and countries without the infrastructure for reliable transportation, drones can do more than take photos or collect data: they can transport supplies to save lives. The Pacific island country of Vanuatu, for instance, has teamed up with UNICEF and two drone companies to deliver vaccines to rural areas. Vanuatu is composed of 83 islands spread over an area that covers 1,600 kilometers ( 1,000 miles). To deliver vaccines to its more rural communities, health workers often have to walk for hours -- sometimes, it can even take them days by cars and/or boats. Drones could ensure that local health facilities have quick access to lifesaving supplies when needed.

This September, delivery drones will begin to fly the friendly skies of Vanuatu. And this isn't a one-shot demonstration, like many of the stunts we've seen from the likes of Amazon and Google. This is an attempt to make drones part of the medical infrastructure. The South Pacific island nation of Vanuatu, a string of 83 volcanic islands spread over 1600 kilometers (995 miles), has just issued a "request for tender" to drone companies around the world. The companies are invited to submit bids for bringing vaccines to scattered hospitals and health clinics on three islands.