RelayRides and SnapGoods match up owners and renters; smartphones with GPS let people see where the nearest rentable car is parked; social networks provide a way to check up on people and build trust; and online payment systems handle the billing

Mr Jobs had a reputation as a control freak?（怪人）, and his critics complained that the products and systems he designed were closed and inflexible, in the name of greater ease of use.

All of which, combined with California's reputation as the home of technological?innovation, makes the place ideal for developing and testing systems designed to monitor pollution in?detail.

At the end of the day, these kinds of systems are primarily designed to protect against the sort of opportunistic smash-and-grab attack that makes up the majority of burglaries.

David Hunt, an associate professor in sociology at Augusta University, which has rolled out digital textbooks across its math and psychology departments, told BuzzFeed News that he understands the utility of using systems that require access codes.

Digital learning systems now charge students for access codes needed to complete coursework, take quizzes, and turn in homework.

For example, 10 bacteria or less of an especially deadly strain of bacteria can cause severe illness and death in people with compromised immune systems.

It was not known, however, whether central fatigue might also affect motor systems not directly involved in the exercise itself, such as those that move the eyes.

Jamming concerns are nothing new, and they're not unique to security systems.

John Chambers, chairman of cisco Systems Inc., a worldwide leader in electronics products, says that "we compete against market transitions, not competitors."

Most roads, bridges, transit, water systems, the electric grid, and communications networks were installed 50 to 100 years ago, and they are largely taken for granted until they fail.

Natural disasters can wreck a community 5s infrastructure, disrupting systems for months or years.

No matter how the math works out, you persistently view restaurants with voluntary tipping systems as being a better value, which makes it extremely difficult for restaurants and bars to do away with the tipping system.

Other systems also seem confident on the subject of jamming.

So it isn't surprising that you'll find plenty of strong opinions about the potential vulnerabilities of popular home-security systems.

The textbook industry insists the online systems represent a better deal for students.

The United States has one of the best highway systems in the world.

with surging obesity levels putting increasing strain on public health systems, governments around the world have begun to toy with the idea of taxing sugar as well.

without upgrades and new capacity, bridges, roads and power systems are unable to cope with expanding populations.

Engineers, scientists and agriculturalists have the knowledge, tools and systems that will assist in achieving productivity increases.

Same goes for surgeons, who're using robotic systems to perform an ever-growing list of operations-not because the machines save money but because, thanks to the greater precision of robots, the patients recover in less time and have fewer complications, says Dr. Myriam Curet.

Why are robotic systems replacing surgeons in more and more operations according to Dr. Myriam Curet?

They had titles like Young vs Old, Gray Dawn and The Coming Generational Storm, and their message was blunt: health-care systems were heading for the rocks, pensioners were taking young people to the cleaners, and soon there would be intergenerational warfare.

After all, we don't speak only of objects or people as having momentum; we speak of entire systems having momentum.

Another type of momentum we have to think about when planning for changes in our energy systems is labor-pool momentum.

As I said, we need to understand the best ways of avoiding climate change and this will involve a huge transition to low-carbon energy systems and the transition is a tremendous priority.

Big, complicated systems on which much public safety depends, like driverless cars, should be built, programmed and sold by manufacturers who take responsibility for ensuring safety and are liable for accidents.

But researchers are improving systems to measure a teacher's performance throughout the year, and, with three years of data, it's usually possible to tell which teachers are failing.

By far the biggest type of momentum that comes into play when it comes to changing our energy systems is economic momentum.

In physics, moving objects have two characteristics relevant to understanding the dynamics of energy systems: inertia and momentum .

New electric engines coupled with artificial intelligence and autonomous systems will contribute to a more efficient, integrated transport system that is less polluting and less noisy.

The major components of our energy systems, such as fuel production, refining, electrical generation and distribution, are costly installation that have lengthy life spans.

The trouble is, for many of the researchers who'd like to design systems to address these challenges, massive datasets for experimentation just don't exist—at least, not in formats that are accessible to academic researchers.

They were able to accurately place the hair samples in broad regions roughly corresponding to the movement of rain systems.

Unfortunately for them and often the taxpayers, our energy systems are a bit like an aircraft carrier : they are unbelievably expensive, they are built to last for a very long time, they have a huge amount of inertia meaning it takes a lot of energy to se

We can expect that the ever-growing list of devices, systems and environments remain connected, always online and talking to each other.