A considerable lot of his thoughts were an antecedent of the advanced plane. His most celebrated flying machine plans were ornithopters, or machines that should have been fueled by man by fluttering bat-like wings like a feathered creature. ... Da Vinci was the first to think about the logical idea of lift, the power that empowers a flying machine to fly.
<span>The introduction of new power sources</span>
Right to life and liberty so that would be B
