The Bubbles water taxi flies above the surface of the Seine River during a demonstration by the SeaBubbles company in Paris, France, May 22, 2018.

A prototype of the Cormorant, a drone, is pictured at Urban Aeronautics' workshop in Yavne, Israel December 22, 2016.

The Bubbles water taxi flies above the surface of the Seine River near the Notre Dame Cathedral during a demonstration by the SeaBubbles company in Paris, France, May 22, 2018.

Anders Bringdal, founder and president, Camille Therond-Charles, deputy managing director and Alain Thebault, founder and vice-president of French startup SeaBubbles, are seen aboard a prototype of their water taxi, in the harbour of Saint-Tropez, France August 18, 2017.

A 3D-printed carbon fiber commuter bicycle by Arevo Labs is seen in Santa Clara, California, May 10, 2018. Image used for illustrative purposes

An attendee looks over a prototype hydrogen powered fuel cell semi-truck shown by Toyota at the Los Angeles Auto Show in Los Angeles, California, U.S., November 30, 2017.

Roads and Transport Authority (RTA) unveil the design model of the hyperloop in Dubai, United Arab Emirates February 22, 2018. Hyperloop technology uses an electromagnetic propulsion system to accelerate the movement of goods and services through a vacuum tube. The system is designed to assist the levitation of the capsule slightly off the track within the tube and move it at speed up to 1200 km/hour. Accordingly, the hyperloop could travel between Dubai and Abu Dhabi in 12 minutes (about 90 minutes in a car), and lift about 10,000 passengers per hour in both directions. REUTERS/Christopher Pike

Roads and Transport Authority (RTA) unveil the design model of the hyperloop in Dubai, United Arab Emirates February 22, 2018. Hyperloop technology uses an electromagnetic propulsion system to accelerate the movement of goods and services through a vacuum tube. Image used for illustrative purpose.

Toyoda Gosei Co Ltd's personal mobility concept airbag car "Flesby" is displayed at the 44th Tokyo Motor Show in Tokyo, Japan, October 28, 2015. REUTERS/Yuya Shino TPX IMAGES OF THE DAY - RTX1TKN2

Tesla's new electric semi truck is unveiled during a presentation in Hawthorne, California, U.S., November 16, 2017.

Daihatsu Motor Co. President Masanori Mitsui speaks next to its concept car NORIORI as staff demonstrates during the presentation at the 44th Tokyo Motor Show in Tokyo, Japan, October 28, 2015. The word NORIORI means in Japanese, "getting on and off". REUTERS/Yuya Shino - RTX1TKEK

Honda Motor Co's personal mobility concept self-driving car "Wander Stand" is seen at the 44th Tokyo Motor Show in Tokyo, Japan, October 28, 2015. REUTERS/Yuya Shino - RTX1TL19

Image used for illustrative purpose only. A staff member of Toyota Motor Corp drives its self-driving technology "Mobility Teammate Concept" prototype car hands-free on the Metropolitan Expressway during the Toyota Advanced Technologies media preview in Tokyo, Japan, October 8, 2015. REUTERS/Yuya Shino - RTS3JW3

Toyota Motor Corp's hydrogen fuel-cell concept car Toyota FCV PLUS is displayed at the 44th Tokyo Motor Show in Tokyo, Japan, October 28, 2015. Image for illustrative purposes. TPX IMAGES OF THE DAY- RTX1TKC4

Image used for illustrative purpose. A line of Lexus SUVs equipped with Google self-driving sensors await test riders during a media preview of Google's prototype autonomous vehicles in Mountain View, California September 29, 2015. REUTERS/Elijah Nouvelage - RTS2BZQ

Roads and Transport Authority (RTA) unveiled the design model of the hyperloop in Dubai, United Arab Emirates February 22, 2018. Hyperloop technology uses an electromagnetic propulsion system to accelerate the movement of goods and services through a vacuum tube. The system is designed to assist the levitation of the capsule slightly off the track within the tube and move it at speed up to 1200 km/hour. Accordingly, the hyperloop could travel between Dubai and Abu Dhabi in 12 minutes (about 90 minutes in a car), and lift about 10,000 passengers per hour in both directions.

Kenny Chua pilots the Snowstorm, a personal flying machine built by a group of engineering students of the National University of Singapore (NUS), at NUS gymnasium in Singapore December 10, 2015. The prototype, a collaboration between the Engineering faculty's Design-Centric Programme and the University Scholars Porgramme, sports 24 motors each driving a propeller of 76cm in diameter and can bear the load of a single person up to 70kg for a flight time of about five minutes. The flight control system provides automated flight controls similar to Unmanned Aerial Vehicles (UAVs) as well as manual control by the pilot.

Paradigm Hyperloop team from Memorial University in Newfoundland, Canada prepare to run their hyperpod at SpaceX's Hyperloop Pod Competition II in Hawthorne, California, U.S., August 27, 2017.

The Bubbles water taxi flies above the surface of the Seine River past the Eiffel Tower during a demonstration by the SeaBubbles company in Paris, France, May 22, 2018.

Matthias Broda, inventor and designer of the wooden e-bike, cycles a prototype along a street in Berlin, November 20, 2014. The wooden e-bike produced by German company Aceteam from ash wood, will be launched on the market by spring 2015 and will cost around 3,950 euro (4,950 dollars). The e-bike will be equipped with an 250W e-bike motor for a range of up to 100 kilometer (62 miles) with a rechargeable battery. Image used for illustrative purpose.

AeroMobil, a flying car prototype, is pictured during a ceremony marking the taking over of the rotating presidency of the European Council by Slovakia, in Brussels, Belgium, July 7, 2016.

Chris Lee, an engineer at Arevo Labs, watches a 3D-printing robot print a bicycle frame in Santa Clara, California, May 10, 2018.

A view of Airgo's 3D printed prototype of their Orion long-haul aircraft seats at their manufacturing facility in Singapore October 7, 2016.