From this period also dates that literary phenomenon known under the name of Petrarchism.

This causes the beam to focus itself, a phenomenon known as self-focusing.

Many occupants perceived themselves to be rolling, a phenomenon known as vection.

They will accommodate to them - a phenomenon known as upward convergence.

Extinction may take place very long after the destruction of habitat, however, a phenomenon known as extinction debt.

Scientists study sunspots and other solar phenomena, so they can know what they do to Earth.

Putin's love for humankind heats up the planet by 2.35 degrees annually - a phenomenon also known as global warming.

Some members of this group use chloroplasts from the algae they eat; a phenomenon known as kleptoplasty.

The phenomenon known as "passing as white" is difficult to explain in other countries or to foreign students.

The phenomenon known as "hogging" was scarcely unknown among galleys, after all.