Autonomous flying personal transportation -- "the flying car" -- is becoming real. I have written previously about some of the issues such as noise, energy efficiency and "sky pollution" but it's clear that the engineering problems are being solved.

Solving those other problems is a challenge, but I can be more confident in predicting that in the 2020s, many ambulances, police, fire and military vehicles will be based on multirotor technology. This will be particularly true in more rural areas or areas with limited roads.

GM revealed photos of what they say is the production form of their self-driving car based on the Chevy Bolt and Cruise software. They say it will be released next year, making it almost surely the first release from a major car company if they make it.

One of the most useful consumer electronic devices of the past two decades is the DVR, pioneered by TiVo. Many people imagined a hard-disk based video recorder before that, but they showed the way.

So many of the world's great sites are made much worse by the presence of "touts" (also known as hawkers, souvenir sellers etc.) particularly the ones who are pushy, constantly talking to you to advertise their wares, or even getting in your way. They can range from those who just fill the site with cheap souvenirs to those that constantly try to start a conversation with you about something else as a way of catching you off guard.