

Это не моё мнение, а факт.
This isn't my opinion, it's a fact.
В споре он всегда опирается на факты.
In an argument, he always relies on facts.
Ты можешь доказать этот факт?
Can you prove this fact?
"факт" is in the lesson "Philosophy" (Level 44), along with 11 other useful words. LinDuo has 180 topic lessons like this one, 2,380 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.