一 | LONDON -- Elon Musk's social media platform X has begun charging a $1 fee to new users in the Philippines and New Zealand, in a test designed to cut down on the spam and fake accounts flourishing on the site formerly known as Twitter. The company said late Tuesday that it has started trying out the annual subscription method for new and unverified accounts. The program, dubbed Not a Bot, won't apply to existing users. It's not clear why it only applies to New Zealand and the Philippines or why those countries were chosen. “This new test was developed to bolster our already successful efforts to reduce spam, manipulation of our platform and bot activity, while balancing platform accessibility with the small fee amount,” the X support account tweeted. “It is not a profit driver.” Since Musk bought X a year ago, he has introduced a slew of changes such as renaming the platform and gutting its workforce — including its content moderation team. Outside watchdog groups say the changes have allowed misinformation to thrive on the platform, a problem that exploded after the Israel-Hamas war erupted. Musk previously turned to premium subscriptions as a tactic to boost the financially struggling platform’s revenue. One of his first product moves was to shake up the site's blue check verification system by launching a service granting checks to anyone willing to pay $8 a month. A flood of impostor accounts forced the service's temporary suspension days after launch.Under the test, new subscribers will get access to basic functions like posting content, liking or bookmarking posts, and reposting, quoting or replying to posts from other accounts. The platform said new users who don't subscribe will only be able to read posts, watch videos and follow other accounts.。 8月24日消息，当地时间本月22日，俄罗斯极限跳伞运动员谢尔盖·博伊佐夫，在阿尔泰边疆区完成一场高难度高空跳伞挑战，一举刷新热气球载体跳伞项目的世界纪录，并全程对外公开直播。 本次挑战历时整整半年筹备，一支近百人的专业团队全程参与，涵盖热气球工程师、飞行器驾驶员、高空防护装备研发人员、气象分析师、跳伞技术顾问等多个岗位，大量设备采用俄罗斯本土自研技术完成制造。 正式挑战前，团队完成多轮严苛测试：在俄罗斯航天宇航员训练中心的压力舱内，模拟12000米高空低压环境开展人体耐受测试；整套跳伞防护装备在零下60摄氏度低温环境反复验证可靠性；同时借助风洞设备，反复打磨自由落体姿态、降落伞应急操作，并且完成多轮低高度预演跳伞，尽可能规避高空风险。
二 | 升空使用一台容积一万立方米的特制AX-12级别大型热气球，由俄罗斯航空运动联合会主席伊万·梅尼亚罗担任主飞行员，机载工程师杰尼斯·叶菲莫夫配合操作。 热气球当地时间早上6点39分起飞，整场升空飞行耗时3小时01分钟，气球最大升空高度达到11610米，同步刷新俄罗斯本土热气球飞行高度国家纪录。 博伊佐夫于7点54分17秒，在11551米高度离开吊篮纵身跃下，起跳瞬间，热气球自身移动速度约70公里每小时，舱外气温低至零下59摄氏度，高空空气稀薄，低温、缺氧、强气流多重风险叠加，对运动员身体状态、装备稳定性都是极大考验。
三 | 离开吊篮后，博伊佐夫进入自由落体阶段，持续时长2分30秒，下落峰值速度达到501公里每小时。 高速坠落过程中，运动员需要自主控制身体姿态，防止身体失控旋转，避免出现供氧故障、肢体冻伤等致命险情。 下落至距离地面1565米高度，他顺利启动主降落伞，降落伞开伞之后的滑翔降落时长4分49秒，从离舱到双脚落地，全程总降落时长7分19秒，最终平安降落在阿尔泰边疆区乌斯特·卡尔曼斯基地区，热气球机组人员也全部安全落地，挑战全员无受伤情况。 在此之前，该项目世界纪录由波兰极限运动员保持，起跳高度为10060米，博伊佐夫直接把纪录提升接近1500米。
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