EU-Vorschläge für Plastikreduktion reichen nicht aus
Einwegplastik wird zum immer größer werdenden Umweltproblem, insbesondere im Meer. Die EU-Kommission will den Einsatz deutlich verringern, geht in ihren heute vorgelegten Vorschlägen aber nicht weit genug. Der NABU fordert einen Fokus auf Mehrweg. (more…)
Scientists discovered in 1937 that liquid helium-4, when chilled to extremely low temperatures, became a superfluid that could leak through glass, overflow its containers, or eternally gush like a fountain.
Future Nobel laureate Lev Landau came along in 1941, predicting that superfluid helium-4 should contain an exotic, particle-like excitation called a roton. But scientists, including Landau, Nobel laureate Richard Feynman and Wolf Prize recipient Philippe Nozières have debated what structure the roton would take ever since. (more…)
So long, solitons: University of Chicago physicists have shown that a group of scientists were incorrect when they concluded that a mysterious effect found in superfluids indicated the presence of solitons—exotic, solitary waves. Instead, they explain, the result was due to more pedestrian, whirlpool-like structures in the fluid. They published their explanation in the Sept. 19 issue of Physical Review Letters. (more…)
