Lifting objects without touching them may seem like a superpower, but it’s becoming a reality. Researchers from Tokyo Metropolitan University have developed a new method of lifting objects (‘trapping’) using sound, by dividing the sound waves into manageable blocks to manipulate millimetre-sized objects easily, even on reflective surfaces where traditional sound-trapping fails. While they’re still having trouble keeping the objects afloat, they’re hopeful it will become a reliable tool in laboratories, perhaps helping prevent contamination of samples by human touch.
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Kai Cheng’s professor had a brilliant scheme. In his first lecture, he promised that each lecture would feature a “Lie of the Day”. But why? It made his students more attentive and analytical, poring over every detail of his lecture and making sense of why things were true. It was such a powerful teaching method that his students digested his most technical lectures quite easily because they tried so hard to catch his lie. The kicker? There was no lie in that first lecture; he had lied about that too! Read full article here