18% Oxygen

https://twitter.com/Haoyando/status/1351596520274075649 How can one know if a room has less than 18% oxygen? LOL. I try to recall the high school chemistry classes, which happened such a long time ago. Is there an easy way to know the percentage of the oxygen in the air? I mean is there something called oxygen-meter that can check … Continue reading 18% Oxygen

The Favorite Of 2020

I dislike competitions and strive to avoid them as best as I can, because competitions always make me feel dreadful. If I lose, I feel bad; If I win, I feel bad for people who haven't won, and simultaneously I also can't help wondering if the sense of triumph is shallow, short-lived, giving me the … Continue reading The Favorite Of 2020