При сохранении произошла ошибка, попробуйте снова.
Если ошибка повториться, пожалуйста, напишите нам об этом в обратной связи - Написать сообщение!
... that the lightning-rod was not first used by Benjamin Franklin as it is always thought. A Hebrew book written in the 8th century, a thousand years before Franklin, tells us of the lightning conductor:
“Those who erect iron posts in their gardens and put rods there, have a protection against lightning.”
... that mountain guides demand silence when passing under overhanging snow because the vibrations of sound caused by speech may dislodge the snow.
... that astronomy is thought to be the oldest science.
... that the colors of the rainbow are red, orange, yellow, green, blue and violet.
... that the speed of light was first measured in 1676 by Romer.