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Any device that sends out a Wi-Fi signal also emits terahertz waves —electromagnetic waves with a frequency somewhere between microwaves and infrared light. These high-frequency radiation waves, known as “T-rays,” are also produced by almost anything that registers a temperature, including our own bodies and the inanimate objects around us.

Terahertz waves are pervasive in our daily lives, and if harnessed, their concentrated power could potentially serve as an alternate source. Imagine, for instance, a cellphone add-on that passively soaks up ambient T-rays and uses their energy to charge your phone. However, to date, waves are wasted energy, as there has been no practical way to capture and convert them into any usable form.

Now physicists at MIT have come up with a blueprint for a they believe would be able to convert ambient terahertz waves into a , a form of electricity that powers many household electronics.

The White House and the Centers for Disease Control and Prevention are asking Facebook, Google and other tech giants to give them greater access to Americans’ smartphone location data in order to help them combat the spread of the coronavirus, according to four people at companies involved in the discussions who are not authorized to speak about them publicly.

Federal health officials say they could use anonymous, aggregated user data collected by the tech companies to map the spread of the virus — a practice known as “syndromic surveillance” — and prevent further infections. They could also use the data to see whether people were practicing “social distancing.”

Some sources stressed that the effort would be anonymized and that government would not have access to specific individuals’ locations. They noted that users would be required to opt-in to the effort.

WASHINGTON—The Trump administration has bought access to a commercial database that maps the movements of millions of cellphones in America and is using it for immigration and border enforcement, according to people familiar with the matter and documents reviewed by The Wall Street Journal.

The location data is drawn from ordinary cellphone apps, including those for games, weather and e-commerce, for which the user has granted permission to log the phone’s location.

TAIPEI (Reuters) — Taiwan, which has won global praise for its effective action against the coronavirus, is rolling out a mobile phone-based “electronic fence” that uses location-tracking to ensure people who are quarantined stay in their homes.

Governments around the world are combining technology and human efforts to enforce quarantines that require people who have been exposed to the virus to stay in their homes, but Taiwan’s system is believed to be the first to use mobile phone tracking for that purpose.

“The goal is to stop people from running around and spreading the infection,” said Jyan Hong-wei, head of Taiwan’s Department of Cyber Security, who leads efforts to work with telecom carriers to combat the virus.

As they increasingly log on from home, Americans are having to meld their personal technology with professional tools at unprecedented scale. For employers, the concern isn’t just about capacity, but also about workers introducing new potential vulnerabilities into their routine — whether that’s weak passwords on personal computers, poorly secured home WiFi routers, or a family member’s device passing along a computer virus.


The dramatic expansion of teleworking by US schools, businesses and government agencies in response to the coronavirus is raising fresh questions about the capacity and security of the tools many Americans use to connect to vital workplace systems and data.

At one major US agency, some officials have resorted to holding meetings on iPhone group calls because the regular conference bridges haven’t always been working, according to one federal employee. But the workaround has its limits: The group calls support only five participants at a time, the employee noted.

“Things have worked better than I anticipated, but there are lots of hiccups still,” said the employee, who spoke on condition of anonymity because he is not authorized to speak on the record.

Google has announced a new real-time transcription feature for its free Translate app for Android phones. An IOS version is planned for the future, the company says.

The feature will allow users to obtain instantaneous text translations of ongoing speeches, lectures or monologues into any of eight languages, including English.

Currently, Translate allows conversions of only relatively short snippets of .