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Recently, deep multi-agent reinforcement learning (MARL) has demonstrated promising performance for solving challenging tasks, such as long-term dependencies and non-Markovian environments. Its success is partly attributed to conditioning policies on large fixed context length. However, such large fixed context lengths may lead to limited exploration efficiency and redundant information. In this paper, we propose a novel MARL framework to obtain adaptive and effective contextual information. Specifically, we design a central agent that dynamically optimizes context length via temporal gradient analysis, enhancing exploration to facilitate convergence to global optima in MARL. Furthermore, to enhance the adaptive optimization capability of the context length, we present an efficient input representation for the central agent, which effectively filters redundant information. By leveraging a Fourier-based low-frequency truncation method, we extract global temporal trends across decentralized agents, providing an effective and efficient representation of the MARL environment. Extensive experiments demonstrate that the proposed method achieves state-of-the-art (SOTA) performance on long-term dependency tasks, including PettingZoo, MiniGrid, Google Research Football (GRF), and StarCraft Multi-Agent Challenge v2 (SMACv2).

The biggest World Cup ever is pushing fans, players, and host cities to their limits--and experts say this is only the beginning. It's often said that bigger means better. This year's FIFA World Cup may put that to the test. By almost any metric, the 2026 tournament is the largest ever: the most host countries; the longest distances between stadiums; the most players, teams, and matches; and then there's the eye-watering ticket prices . The scale is a logistical nightmare for fans, teams, and host cities. Held across three countries-- Canada, Mexico, and the US--48 teams (up from the usual 32) will navigate 16 host cities separated by thousands of miles and four distinct time zones.

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The 2026 World Cup promises a global celebration. Many Arab fans may find themselves excluded. For the first time in World Cup history, eight Arab nations have qualified for this year's tournament, including Morocco, Tunisia, Egypt, Algeria, Saudi Arabia, Qatar, Iraq, and Jordan--double the number of teams that qualified for Qatar in 2022. Yet, the tournament is taking place at an unprecedented moment of heightened geopolitical tension. The US-Israel war with Iran, which began in February of this year, has caused ripple effects across Gulf states and neighboring countries in the Levant, including Lebanon, Palestine, and Jordan, reshaping the security around travel and mobility for fans and players hailing from the region. The US State Department has fully suspended visa issuance for nationals from countries with teams that qualified, including Iran and Haiti--despite it being the first time Haiti has qualified for a World Cup since 1974.

For Iran's Athletes, There Is No Separating Sports From Politics From defections and protests to moments of national pride, the 2026 World Cup arrives amid decades of tension between identity and the state. Iran's national soccer team has made its 2026 World Cup debut amid a tumultuous backdrop: an abrupt and tentative ceasefire after months of war, an extraordinary set-up in Mexico after the US prevented the team from residing in-country between matches, and political uncertainty that has now expanded to the international stage. But for many Iranians, professional sports have always sat at an intersection between athleticism, identity, and politics. From sporting defections and political activism to moments of immense national sporting pride, the trajectory of Iranian sports underscores what's at stake this World Cup. The Iranian team, on Tuesday morning, drew 2-2 in their debut against New Zealand and will next face Belgium and Egypt, traveling to and from Mexico in between.

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Robot sports, characterized by well-defined objectives, explicit rules, and dynamic interactions, present ideal scenarios for demonstrating embodied intelligence. In this paper, we present VolleyBots, a novel robot sports testbed where multiple drones cooperate and compete in the sport of volleyball under physical dynamics.