小燕子，穿花衣。家燕的体型小巧，树麻雀和它比起来都会显得大一些。离得远，它们看起来黑黢黢的，下巴一撮儿红色很明显，离得近，在阳光的照射下，羽毛本身有色素沉淀，除此以外，羽毛的物理特质使得在一些角度看，因散射、干涉或衍射的产生出的结构色，复合呈现出五彩斑斓的蓝色。照片中可以看到羽毛部分：从结构上分类看是正羽，从功能上分类是飞羽。春季，燕子忙着筑巢抚育下一代，因此，它们会为了找寻建筑材料，多次往返很是辛苦。马上它们就要多起来了～#观鸟 #北京观鸟 #鸟类摄影 #家燕

你不知道的冷知识

小燕子，穿花衣。

家燕的体型小巧，树麻雀和它比起来都会显得大一些。

离得远，它们看起来黑黢黢的，下巴一撮儿红色很明显，离得近，在阳光的照射下，羽毛本身有色素沉淀，除此以外，羽毛的物理特质使得在一些角度看，因散射、干涉或衍射的产生出的结构色，复合呈现出五彩斑斓的蓝色。

照片中可以看到羽毛部分：从结构上分类看是正羽，从功能上分类是飞羽。

春季，燕子忙着筑巢抚育下一代，因此，它们会为了找寻建筑材料，多次往返很是辛苦。

马上它们就要多起来了～

#观鸟 #北京观鸟 #鸟类摄影 #家燕

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你不知道的冷知识 Telegram | DID YOU KNOW?

What is Telegram?

Telegram’s stand out feature is its encryption scheme that keeps messages and media secure in transit. The scheme is known as MTProto and is based on 256-bit AES encryption, RSA encryption, and Diffie-Hellman key exchange. The result of this complicated and technical-sounding jargon? A messaging service that claims to keep your data safe.Why do we say claims? When dealing with security, you always want to leave room for scrutiny, and a few cryptography experts have criticized the system. Overall, any level of encryption is better than none, but a level of discretion should always be observed with any online connected system, even Telegram.

Newly uncovered hack campaign in Telegram

The campaign, which security firm Check Point has named Rampant Kitten, comprises two main components, one for Windows and the other for Android. Rampant Kitten’s objective is to steal Telegram messages, passwords, and two-factor authentication codes sent by SMS and then also take screenshots and record sounds within earshot of an infected phone, the researchers said in a post published on Friday.