Video about numbers: need help with a word I'm not able to ear correctly

[Hibou57]

Please, someone can help me with a word I can't hear at 34:40 in the below video?

The Code S01E01: "Numbers" (youtube.com)

The sentence starts at about 34:19, and the word is at 34:40.

“The radius of a single xxx”. Of a single what?! I can't hear the word , and believe me, I tried multiple times.

With thanks

 

[Hibou57]

I get an answer on an another forum. The answer is: “hydrogen atom”, that is it says “The radius of a single hydrogen atom”.

By the way, the time location was not 34:40, but 34:30. My apologizes for the error.

 

[Imesch]

One can always look online for subtitles. And for such a popular show, they must be really easy to find, in english and also in many more languages