Vì sao trời rét khiến ta run rẩy?
Các nhà khoa học đã tìm hiểu vì sao da chúng ta lại căng lên và răng thì va lập cập mỗi khi một luồng gió lạnh thổi qua. Hệ thần kinh trung ương luôn kiểm soát nhiệt độ da và quyết định khi nào thì ta nên run rẩy.
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