According to the information presented in the lecture, which of the following inventions commonly used today was first designed by Leonardo da Vinci? a.
a helicopter
b.
a parachute
c.
a flying machine
d.
a water tower

Acurious child asked his mother: “mommy, why are some of your hairs turning grey? ” the mother tried to use this occasion to teach her child: “it is because of you, dear. every bad action of yours will turn one of my hairs grey! ” the child replied innocently: “now i know why grandmother has only grey hairs on her head.”