They were a backward people without any writing.

Is it at all probable, that there will ever be a civil war in America, about the presidentship of the United States?

Solar panels allow for energy transfer from light energy to heat and electrical energy.

As what is commonly called the Riemann sphere (after Bernhard Riemann, 1826–1866), the parabolic sphere ̇S² ̇provides a conformal model for the complex projective line C ℙ¹.