ナショナルジオグラフィックのインスタグラム(natgeo) - 1月18日 02時00分

Cover Photo by @Jimmy_chin | It was hailed as the "ultimate" rock climb: a "free solo," no-rope scramble up the 3,000-foot face of Yosemite's El Capitan, the world's most iconic cliff. In our February issue, learn how Alex Honnold's stunning and historic climb up El Capitan, in less than four hours, was the result of meticulous planning and training.

In the February issue you can also go inside the shocking, mysterious sacrifice of 269 children more than 500 years by an ancient society that lived in what is now Peru. And in a two-story package on Silicon Valley two decades after its initial boom, we take a look at how the Valley's tech industry is growing up (sort of), and how tech products' demand for lithium is creating new opportunities and tensions in places like Bolivia, which has huge reserves of the metal.

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• Jimmy_chin