The accession of Poland, the Czech Republic and Hungary to the Western military alliance NATO 20 years ago was celebrated with a military ceremony in Warsaw on Sunday.
What if one day all buildings could be equipped with windows and facades that satisfy the structure's every energy need, whether rain or shine?
A Chinese executive of Huawei arrested earlier this month in Poland on suspicion of spying said on Friday he was not guilty in the case, which has drawn attention to what some Western countries say is a security risk from the world's biggest telecoms equipment company.
Pawel Adamowicz, the liberal mayor of the Polish city of Gdansk, died on Monday of his wounds a day after being stabbed on stage at a charity event.
China on Monday urged countries to end "fabrications" about Huawei, after an official in Poland said his country could limit the use of the company's products by public entities following the arrest of a Huawei employee there on spying allegations.
Huawei said Saturday it has fired a Chinese employee who was arrested in Poland on espionage allegations, as China's telecom giant distanced itself from the case amid Western concerns that it could act as a proxy for Chinese security services.
Poland said Friday it had arrested a Chinese telecoms executive suspected of spying for China, with local media identifying him as a Huawei director.
Five teenage girls killed by a fire in an "escape room" attraction in Poland might have survived if there had been a proper evacuation route, a senior firefighter said on Saturday.
The warnings from science and Earth itself have never been so dire, but nearly 200 nations gathering in Poland next week face stiff headwinds in trying to ratchet up their response to the threat of catastrophic climate change.