TED Talksのインスタグラム(ted) - 11月11日 02時57分

This is a deep cave in Italy. Caves like this one are hidden under the earth and can be more than 600 kilometers (or 372 miles) long. People have been exploring caves systematically for nearly a century, but new ones are still being discovered on every continent. "For each meter of a cave that we already know, there are still some tens of kilometers of undiscovered passages," explains speleologist Francesco Sauro. Learn more at go.ted.com/discovercaves
Photo by Stefan Walter

[BIHAKUEN]UVシールド(UVShield)

>> 飲む日焼け止め！「UVシールド」を購入する