On the example of the history of the discovery of the "solar substance" Helium, the history of the most important discoveries in the field of physics and chemistry of the early XX century is given.
| Actor | Role |
|---|---|
| NNikolai MamunaNot listed | Not listed |
| YYevgeniy BurmistrovNot listed | Not listed |
 Kirill VatsNot listed | Not listed |
 Gennady NikiforovNot listed | Not listed |
| AAlexis AvanesoffNot listed | Not listed |
 Gleb PlaksinNot listed | Not listed |
 Vsevolod AbdulovNot listed | Not listed |