2011年，爱丁堡大学教授哈拉尔哈斯在TED做了一场关于Lifi技术的演讲。Lifi是一种基于可见光的通信技术，通过LED灯的光传输数据和信息，为各种终端产生网络信号。
I need to make a four posts featured content slider but not with the latest 4 posts. Instead I wanna define certain posts as featured, now I know I can make a new category as Featured and add it as a
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