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人类远古近亲在 150 万年前相遇

2024-12-02 15:28 by 布兰尼肯夫人

大约 150 万年前,两个古老的物种在肯尼亚的一个湖边相遇。他们在泥里的脚印被时间冻结,直到 2021 年才被发现。对这些印痕的分析表明,它们属于直立人,现代人类的祖先,以及更远的近亲波伊塞傍人。两人在几小时或几天内穿过了湖区,留下了不同古人类物种在同一地方共存的第一个直接记录。脚印保存了这些人的细节,包括足弓的高度、脚趾的形状和行走方式。利用基于 3D X 射线的成像技术,研究人员研究了脚的运动是如何塑造它留下的痕迹的。他们将古人类脚印的足弓深度和脚趾角度与人类脚印进行了比较。分析表明,这些孤立的脚印属于直立人个体,直立人被认为是第一个像现代人一样直立行走和奔跑的人类物种。这一物种的脚比较平,大脚趾的位置也在不断变化。与人类的大脚趾相比,它们的大脚趾的活动范围更大,右脚可以向外倾斜 19 度,左脚可以向外倾斜近 16 度,而人类的大脚趾向外伸展约 10 度。

https://www.science.org/doi/10.1126/science.ado5275
https://www.ebiotrade.com/newsf/2024-11/20241129074700480.htm

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人类远古近亲在 150 万年前相遇

2024-12-02 15:28 by 布兰尼肯夫人

大约 150 万年前,两个古老的物种在肯尼亚的一个湖边相遇。他们在泥里的脚印被时间冻结,直到 2021 年才被发现。对这些印痕的分析表明,它们属于直立人,现代人类的祖先,以及更远的近亲波伊塞傍人。两人在几小时或几天内穿过了湖区,留下了不同古人类物种在同一地方共存的第一个直接记录。脚印保存了这些人的细节,包括足弓的高度、脚趾的形状和行走方式。利用基于 3D X 射线的成像技术,研究人员研究了脚的运动是如何塑造它留下的痕迹的。他们将古人类脚印的足弓深度和脚趾角度与人类脚印进行了比较。分析表明,这些孤立的脚印属于直立人个体,直立人被认为是第一个像现代人一样直立行走和奔跑的人类物种。这一物种的脚比较平,大脚趾的位置也在不断变化。与人类的大脚趾相比,它们的大脚趾的活动范围更大,右脚可以向外倾斜 19 度,左脚可以向外倾斜近 16 度,而人类的大脚趾向外伸展约 10 度。

https://www.science.org/doi/10.1126/science.ado5275
https://www.ebiotrade.com/newsf/2024-11/20241129074700480.htm

#科学

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This ability to mix the public and the private, as well as the ability to use bots to engage with users has proved to be problematic. In early 2021, a database selling phone numbers pulled from Facebook was selling numbers for $20 per lookup. Similarly, security researchers found a network of deepfake bots on the platform that were generating images of people submitted by users to create non-consensual imagery, some of which involved children. The Russian invasion of Ukraine has been a driving force in markets for the past few weeks. The company maintains that it cannot act against individual or group chats, which are “private amongst their participants,” but it will respond to requests in relation to sticker sets, channels and bots which are publicly available. During the invasion of Ukraine, Pavel Durov has wrestled with this issue a lot more prominently than he has before. Channels like Donbass Insider and Bellum Acta, as reported by Foreign Policy, started pumping out pro-Russian propaganda as the invasion began. So much so that the Ukrainian National Security and Defense Council issued a statement labeling which accounts are Russian-backed. Ukrainian officials, in potential violation of the Geneva Convention, have shared imagery of dead and captured Russian soldiers on the platform. At the start of 2018, the company attempted to launch an Initial Coin Offering (ICO) which would enable it to enable payments (and earn the cash that comes from doing so). The initial signals were promising, especially given Telegram’s user base is already fairly crypto-savvy. It raised an initial tranche of cash – worth more than a billion dollars – to help develop the coin before opening sales to the public. Unfortunately, third-party sales of coins bought in those initial fundraising rounds raised the ire of the SEC, which brought the hammer down on the whole operation. In 2020, officials ordered Telegram to pay a fine of $18.5 million and hand back much of the cash that it had raised. The message was not authentic, with the real Zelenskiy soon denying the claim on his official Telegram channel, but the incident highlighted a major problem: disinformation quickly spreads unchecked on the encrypted app.
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