The summary is:
The speaker welcomes the audience to the channel and thanks them for their support. He also promotes his other channel, where he teaches English in English only. He explains the present simple tense and gives examples of sentences with different subjects and verbs. He also introduces some expressions and phrasal verbs. He encourages the audience to do the exercises and watch the other playlists. He ends by saying that summer is ending and it is time to learn English intensively.
Here are the key facts extracted from the text:
1. A Korean nuclear fusion reactor achieved 100 million°C for 30 seconds.
2. The experiment represents a significant step forward in nuclear fusion research.
3. The temperature achieved is nearly seven times hotter than the core of the Sun.
4. The core of the Sun has a temperature of close to 15.7 million Kelvin.
5. The surface temperature of the Sun is approximately 5800 Kelvin.
Please note that these are factual statements based on the information provided in your text and from reliable sources. If you need more details or have another request, feel free to ask!