Hòn đá lạ phát Wi-Fi khi đốt lửa
Cập nhật: 16:10 18/02/2016 GMT+7
Thoạt nhìn, nhiều người tưởng rằng đây chỉ là hòn đá bình thường. Tuy nhiên, khi châm lửa đốt, đủ lượng nhiệt làm nóng lên, tảng đá liền phát ra sóng Wi-Fi.
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