Topic Details (Notes format)

Which language has the most native speakers in the world?

Which part of the electromagnetic spectrum has longer wavelengths than visible light but shorter than microwaves?

Who discovered the complement system?

Which American inventor created the phonograph in 1877?

Which is the world’s largest desert?

Which African kingdom developed in Ethiopia, historically known for the rock-hewn churches of Lalibela?

Who discovered Supernova SN 1987A?

Which element has the chemical symbol "H"?

What is the hardest natural substance on Earth?

Who discovered meitnerium?