It's scary to walk in a thunderstorm.

In ancient times, people believed that when thunder roared, the gods were angry.

Mr. Kaminari is my best friend.

I woke up last night because of the sound of thunder.

The thunder roared as rarely seen.

I was scared because there was thunder last night.

That disease is caused by a mutation.

Mercury(II) fulminate is a very sensitive explosive and needs to be handled properly.

In organic chemistry, fulminic acid is produced from carbon monoxide and ammonia.

This building is equipped with lightning protection, so there is no need to worry about being struck by lightning.