The US on Friday authorised the “voluntary departure” of non-essential staff from its consulate in Shanghai and recommended that Americans not travel to China owing to tough Covid restrictions there.
The families of all US personnel are also allowed to leave, the State Department said.
The agency advised US citizens against travelling to Shanghai, China's economic capital and largest city, “due to Covid-19 related restrictions, including the risk of parents and children being separated".
China has been battling its worst wave of infections since the start of the pandemic and Shanghai has been under total or partial lockdown for two weeks, with more than 25 million people ordered to stay at home.
China, where the coronavirus was first detected in the central city of Wuhan in late 2019, is among the last remaining places in the world to enforce a zero-Covid approach to the pandemic.
In Shanghai, the government implemented a policy of separating coronavirus-positive children from parents who tested negative, but then had to relax it following criticism.
White hydrogen: Naturally occurring hydrogen
Chromite: Hard, metallic mineral containing iron oxide and chromium oxide
Ultramafic rocks: Dark-coloured rocks rich in magnesium or iron with very low silica content
Ophiolite: A section of the earth’s crust, which is oceanic in nature that has since been uplifted and exposed on land
Olivine: A commonly occurring magnesium iron silicate mineral that derives its name for its olive-green yellow-green colour
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The Written World: How Literature Shaped History
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The burning issue
The internal combustion engine is facing a watershed moment – major manufacturer Volvo is to stop producing petroleum-powered vehicles by 2021 and countries in Europe, including the UK, have vowed to ban their sale before 2040. The National takes a look at the story of one of the most successful technologies of the last 100 years and how it has impacted life in the UAE.
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What is blockchain?
Blockchain is a form of distributed ledger technology, a digital system in which data is recorded across multiple places at the same time. Unlike traditional databases, DLTs have no central administrator or centralised data storage. They are transparent because the data is visible and, because they are automatically replicated and impossible to be tampered with, they are secure.
The main difference between blockchain and other forms of DLT is the way data is stored as ‘blocks’ – new transactions are added to the existing ‘chain’ of past transactions, hence the name ‘blockchain’. It is impossible to delete or modify information on the chain due to the replication of blocks across various locations.
Blockchain is mostly associated with cryptocurrency Bitcoin. Due to the inability to tamper with transactions, advocates say this makes the currency more secure and safer than traditional systems. It is maintained by a network of people referred to as ‘miners’, who receive rewards for solving complex mathematical equations that enable transactions to go through.
However, one of the major problems that has come to light has been the presence of illicit material buried in the Bitcoin blockchain, linking it to the dark web.
Other blockchain platforms can offer things like smart contracts, which are automatically implemented when specific conditions from all interested parties are reached, cutting the time involved and the risk of mistakes. Another use could be storing medical records, as patients can be confident their information cannot be changed. The technology can also be used in supply chains, voting and has the potential to used for storing property records.
