All articles tagged with #tusk
An international team used tensor tomography to map the narwhal tusk from nano to macro scales and found the outer dentine forms a left-handed helix while the inner mineralized collagen spirals in the opposite direction, creating a stable double-spiral structure that is genetically encoded and continues to grow, offering insights for materials design and clues about past environmental conditions.
Researchers using advanced 3D X-ray imaging from multiple synchrotrons revealed that the narwhal’s tusk is a double spiral: the outer cementum twists left, the inner dentin twists right, forming a biological counterbalance that enhances strength. The tusk, which is the narwhal’s left canine and can exceed two meters, grows through the jaw and lip and is commonly seen as a sexual signal, though its exact function remains debated. The findings, published in Nature, also suggest the growth pattern is genetically programmed and that the tusk could serve as a record of environmental change over the animal’s roughly 80-year lifespan, potentially inspiring new materials design.
A Nature Communications study using CT, diffraction, SAXS, tensor tomography and microscopy shows narwhal tusks contain two spirals—cementum left-handed and dentine right-handed—forming a double helix that gives exceptional stiffness and straight growth, and may record environmental changes across a whale's lifetime.
Poland's prime minister, Donald Tusk, urged “truth” and “mutual respect” at the Ukraine Recovery Conference in Gdańsk after Ukraine’s Zelensky skipped the event amid a diplomatic row over Poland’s decision to name a unit after the controversial Ukrainian Insurgent Army (UPA). Poland accuses the UPA of atrocities against Poles in Volhynia during World War II, while Ukraine — which has faced a war with Russia — views the naming as unacceptable, leading Zelensky to return Poland’s Order of the White Eagle. Although the spat tests relations, Warsaw says it will not derail support for Ukraine as Kyiv seeks billions in aid, reconstruction investments, and progress toward EU membership; the conference nonetheless highlights ongoing tensions between the two allies.
Poland’s Prime Minister Donald Tusk is caught between supporting Ukraine and growing domestic backlash after Zelensky renamed a WWII-era unit; Warsaw revoked Zelensky’s top state honor, and Zelensky skipped the Ukraine Recovery Conference in Gdansk, signaling a deeper rift. President Nawrocki’s hardline stance on Ukraine and shifting public opinion complicate Tusk’s EU-aligned foreign policy as Poland weighs its role with Kyiv ahead of 2027 elections, creating a delicate balancing act for the premier.
A power struggle between Poland's Prime Minister Donald Tusk and President Karol Nawrocki over international representation is undermining the country's diplomatic efforts, especially regarding the upcoming G20 summit, with tensions over who should speak for Poland on the global stage.
Polish President Karol Nawrocki's upcoming meeting with Donald Trump at the White House has heightened tensions with Prime Minister Donald Tusk and the pro-European government, as Nawrocki pursues an independent foreign policy, supports stronger US-Poland relations, and takes a more nationalist stance on Ukraine and NATO, potentially impacting Poland's role in regional security and its response to the Ukraine conflict.
Polish Prime Minister Donald Tusk suggested that a ceasefire or freezing of the Russia-Ukraine conflict could occur soon, amid ongoing diplomatic efforts involving the US, Russia, and Ukraine, with upcoming high-stakes summits and deadlines aiming to resolve the conflict.
Poland's new president and Prime Minister Donald Tusk are expected to face political deadlock and clashes over domestic reforms, but may find common ground in strengthening the military. Tusk is reshuffling the government to address public demands for change, while managing coalition tensions with key party figures like Hołownia.
Polish Prime Minister Donald Tusk has warned far-right vigilantes on the German border to cease their illegal patrols, as tensions rise over border security and internal political stability. The government has reinstated border checks with Germany and Lithuania amid concerns over migrant returns, while vigilante groups, supported by some nationalist figures, have been causing disruptions. Tusk's government is under pressure to reassert control following recent electoral losses and internal coalition tensions, with plans for a cabinet reshuffle to strengthen his authority.
Polish politician Donald Tusk is expected to win a confidence vote, but his efforts to govern face significant challenges from newly elected President Karol Nawrocki, a populist backed by the Law and Justice party and U.S. interests, who has a strong electoral mandate and is likely to oppose Tusk's reforms.
Polish Prime Minister Donald Tusk plans to request a confidence vote in parliament following the defeat of his candidate Rafal Trzaskowski in the presidential election, which was won by nationalist candidate Karol Nawrocki, marking a shift towards conservative and Eurosceptic policies in Poland.
French President Macron, German Chancellor Scholz, and former European Council President Tusk are working to reconcile differences over Ukraine strategy, with a recent summit in Berlin amid heightened tensions between Berlin and Paris. Macron's push for a French-Ukrainian security agreement also exposed reservations on aid to Ukraine from parties at both ends of the political spectrum.
French President Macron will meet with German Chancellor Scholz in Berlin, joined by Polish Prime Minister Tusk, to address tensions over Ukraine. The meeting aims to show unity following recent public disagreements between France and Germany on military support for Ukraine. Macron's postponed visit to Ukraine and his increasingly hawkish rhetoric have added to the strained relations. The leaders hope to use the Weimar format to strengthen European security, but concrete decisions are not expected from the talks.
Polish state TV channel suspends broadcasting as part of a standoff with former European Council President Donald Tusk, who is launching a new political party. The move comes amid tensions between the ruling Law and Justice party and Tusk's opposition party, with critics accusing the government of exerting control over state media.