First theorized in 1938, heat's wave-like flow through superfluids, known as "second sound", has proven difficult to directly observe. Now, a new technique has finally done it, and could be used to ...
In the first half of 2025, the S&P 500 (SPY) staged a remarkable rebound. It returned around 5.5%. The buying momentum accelerated in the second quarter, reversing a steep sell-off after President ...
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