When you first moved to Colorado or took a trip up in the mountains, did you ever feel winded or even a little sick? The reason you may feel out of breath or sick in higher altitudes has to do with ...
FILE - A health worker uses a pulse oximeter to check the oxygen saturation level of another after administering COVID-19 vaccine at a hospital in Gauhati, India, Jan. 21, 2021. (AP Photo/Anupam Nath, ...
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