Shortwave Radio
When John heard a shortwave radio for the first time, he couldn't believe his ears. Wi...
Every seventy-five years, a bright jet of light races across the Earth's atmosphere. This long trail of bright light is called Halley's Comet. This famous comet was given its name for the astronomer Edmond Halley who discovered it in 1758. Halley found that the comets that appeared in 1531, 1607, and 1682 were the same object returning every 75-76 years. The first appearance of Halley's Comet was recorded in 240 BCE by Chinese astronomers. The last sighting of Halley's Comet was in 1986. Astronomers predict that the comet will return once again in 2061. Halley's Comet is the first periodic comet ever known, and it is the only comet that humans can see. Just think, you will be as old as your grandparents when Halley's Comet returns. Remember to keep a look out for it in 2061!
When John heard a shortwave radio for the first time, he couldn't believe his ears. Wi...
The Yangtze River is the third longest river in the world. It is located in China. For tho...
Hieroglyphics is a kind of writing. It uses pictures instead of words. The hieroglyphics m...