The device allows people in the cities to see – and interact with – one another in real time.

The device allows people in the cities to see – and interact with – one another in real time.
The measures were due to go into effect at the start of the new school year next week.
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The Polish and German interior ministers have jointly proposed a system under which the EU would grant €1,000 for each refugee.
The Polish government admits that there are “legal doubts” over such a unilateral embargo by an EU member state.
“They gave us a home, food, clothes. We are happy that at least we can say thank you for it.”
A survey shows strongly positive views towards Poland’s acceptance of refugees among people in the UK, France, Germany, Spain, Italy and the US.
Poland was among Europe’s leaders in installing wind capacity, but new restrictions saw investment dry up after 2016.
Polish state TV, a government mouthpiece, has suggested Donald Tusk, PO and the EPP are among “Putin’s useful idiots”.
The US president also praised the Polish people for “opening their hearts and their homes” to Ukrainian refugees.
Poland will also not support any system to relocate the refugees to other countries against their will, says the ruling party chairman.
The state tourism agency has sought to reassure international travellers that Poland remains a safe destination.
The development minister, Piotr Nowak, had been in the role for less than five months.
The new measures go into force on Monday.
His NGO, CORE, will provide Kraków with organisational and material support.