The RNA world hypothesis proposes that early life was based on RNA, which subsequently devolved the storage of information to more stable DNA, and catalytic functions to more versatile proteins.

Nonlinear optics is the study of how intense light interacts with matter. The optical response of a material usually scales linearly with the amplitude of the electric field. At high powers, however, ...

The common type of loudspeaker that uses a magnetic field to move a cone-shaped diaphragm. When alternating current (the audio signal) is applied to the coil, the diaphragm vibrates and causes air to ...