antimatter
Antimatter is a type of matter that is the exact opposite of regular matter. It is made up of antiparticles, which are particles that have the same mass and charge as regular particles, but they are opposite in every other way.
When antimatter and regular matter come into contact, they annihilate each other, which causes a lot of heat and radiation.
The experiment to create antimatter was a disaster, and it caused a lot of damage.