The summary is:
The video is a gameplay of Human Fall Flat, a physics-based puzzle game, where the players are trying to complete the ice level. They have to use various objects such as ice cubes, planks, rocks and logs to create bridges, shade and fire. They also have to balance on scales, snowboards and gondolas. They encounter many challenges and funny moments along the way, such as breaking glass, sliding off cliffs and holding onto each other. They finally reach the toy factory and end the video.
Here are the key facts extracted from the text:
1. A nuclear fusion reaction was sustained at over 100 million°C for 30 seconds.
2. The temperature achieved is nearly seven times hotter than the core of the Sun.
3. The core of the Sun has a temperature of close to 15.7 million Kelvin.
4. The surface temperature of the Sun is approximately 5800 Kelvin.
5. The experiment marks a move from nuclear fusion being a physics problem to an engineering one.
6. A net energy gain was achieved in the nuclear fusion experiment.
Please note that these are simplified statements and the full context can provide more details.