Leonardo Davinci
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Franklin roosevelt and were around for war.
Many ancient cultures had ink that was used for writing. The oldest empires to use ink were China and India.
Because one of his friend was Doug someone (writing) and he did it a lazy way and then they wanted to make more letters in cursive.
The year that the chalkboard was invented is not known. Some interesting facts we do know are, schools in India were using writing slates back in the 11th century. Also, large blackboards in school rooms were used in Europe dating back to the 16th century.
so that can reflect the sunlight yo any angle of the mirror