Stocks: Real-time U.S. stock quotes reflect trades reported through Nasdaq only; comprehensive quotes and volume reflect trading in all markets and are delayed at least 15 minutes. International stock ...

Abstract: Graded reading is one of the important ways of English learning. How to automatically judge and grade the difficulty of the English reading corpus is of great significance for precision ...

Abstract: Multiobjective feature selection (MOFS) aims to find a set of feature subsets that achieves a tradeoff between two objectives, i.e., reducing the number of selected features and improving ...

Bitcoin’s mining difficulty ended 2025 near record levels and is expected to increase again in early January, as faster-than-target block production triggers another upward adjustment. The network’s ...