World
| Beer mug whistle:
In ancient England in some pubs the beer was served in beer mugs with whistle in the handle, so that when your beer is over, you can whistle for more.
| |
| World
| Silver medals:
In the 1896 summer Olympics a silver medal was awarded to the winners. The second place received bronze medal.
| |
|
World
| Balloon air:
Every of the billions molecules in an air balloon moves with speed of a rocket plane.
| |
| World
| Osmium:
The heaviest metal found on Earth is osmium. A cube with size 33 cm x 33 cm x 33 cm (13 in x 13 in x 13 in) of osmium will weigh as much as a small car.
| |
|
World
| The longest year:
The longest year was the 46 year b.c. It's length was 455 days. It was prolonged with 90 days so that it fits with the seasons. It's also known as the "year of confusion".
| |
| World
| Why you can't hear phone conversations in a noisy room:
Your phone doesn't make it easier for your brain to hear the voice coming from the other side of the line. That's because the noises in the room that you are in get mixed with the sound that's coming from the other phone. To hear better, just cover the mouthpiece of the phone.
| |
|
World
| Yoyo:
Yoyos used to be a weapon back in 1500. In Tagalog, "yoyo" means "come-come".
| |
| World
| Visible light:
We all know that there is some part of the light spectrum that we can perceive and some that we can't. But how much light can the human eye see? Imagine that the whole spectrum of light is a film tape that is 36,000 km (20,000 miles)long. Then the visible light will be only one frame that is located somewhere in the middle...
| |
|
