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科学家发现乌鸦能掌握几何规律性，这是首次在人类之外的动物中发现几何直觉。人类非常擅长从形状中观察到几何规律性。其它动物也具有某种与生俱来的几何感，但此前的研究并没有测试它们是否能区分几何规律。研究人员表示其它动物可能也具有几何直觉。在实验中，研究对象是两只腐肉乌鸦，它们参加了在计算机屏幕上找不同几何形状的游戏。它们必须从屏幕上的一组形状中识别不同的形状从而获得美味食物的奖励。举例来说，屏幕上展示五个月亮和一朵花，乌鸦必须正确啄花朵才能获得奖励。在乌鸦熟悉游戏之后，研究人员开始展示正方形、平行四边形或不规则四边形等各种形状。举例来说，研究人员展示了四个完美的正方形以及一个略微变形的四边形。这些四边形都十分相似，乌鸦能否识别其中的异常？结果显示乌鸦能够。测试表明乌鸦能感知直角、平行线和对称性。 NPR: A crow's math skills include geometry Science Advances：Crows recognize geometric regularity
科学家发现乌鸦能掌握几何规律性，这是首次在人类之外的动物中发现几何直觉。人类非常擅长从形状中观察到几何规律性。其它动物也具有某种与生俱来的几何感，但此前的研究并没有测试它们是否能区分几何规律。研究人员表示其它动物可能也具有几何直觉。在实验中，研究对象是两只腐肉乌鸦，它们参加了在计算机屏幕上找不同几何形状的游戏。它们必须从屏幕上的一组形状中识别不同的形状从而获得美味食物的奖励。举例来说，屏幕上展示五个月亮和一朵花，乌鸦必须正确啄花朵才能获得奖励。在乌鸦熟悉游戏之后，研究人员开始展示正方形、平行四边形或不规则四边形等各种形状。举例来说，研究人员展示了四个完美的正方形以及一个略微变形的四边形。这些四边形都十分相似，乌鸦能否识别其中的异常？结果显示乌鸦能够。测试表明乌鸦能感知直角、平行线和对称性。 NPR: A crow's math skills include geometry Science Advances：Crows recognize geometric regularity
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Spiking bond yields driving sharp losses in tech stocks
A spike in interest rates since the start of the year has accelerated a rotation out of high-growth technology stocks and into value stocks poised to benefit from a reopening of the economy. The Nasdaq has fallen more than 10% over the past month as the Dow has soared to record highs, with a spike in the 10-year US Treasury yield acting as the main catalyst. It recently surged to a cycle high of more than 1.60% after starting the year below 1%. But according to Jim Paulsen, the Leuthold Group's chief investment strategist, rising interest rates do not represent a long-term threat to the stock market. Paulsen expects the 10-year yield to cross 2% by the end of the year.
A spike in interest rates and its impact on the stock market depends on the economic backdrop, according to Paulsen. Rising interest rates amid a strengthening economy "may prove no challenge at all for stocks," Paulsen said.
How to Use Bitcoin?
n the U.S. people generally use Bitcoin as an alternative investment, helping diversify a portfolio apart from stocks and bonds. You can also use Bitcoin to make purchases, but the number of vendors that accept the cryptocurrency is still limited. Big companies that accept Bitcoin include Overstock, AT&T and Twitch. You may also find that some small local retailers or certain websites take Bitcoin, but you’ll have to do some digging. That said, PayPal has announced that it will enable cryptocurrency as a funding source for purchases this year, financing purchases by automatically converting crypto holdings to fiat currency for users. “They have 346 million users and they’re connected to 26 million merchants,” says Spencer Montgomery, founder of Uinta Crypto Consulting. “It’s huge.”
