How can a microwave oven cook food so fast?

Unlike other ovens, which cook food with heat waves made from burning gas or electric currents, microwave ovens use special bands of electromagnetic energy called microwaves (similar to light waves) to cook food.

Which country is the smallest?

 The smallest country in the world is Vatican City. It is located on 108.7 acres (or 44 ectares, which is not even half a square mile) in the city of Rome, Italy. 

Which country is the largest?

Russia is the largest country in the world, with 6,592,812 square miles (17,075,383 square kilometers) of area. 

Acceptable Noise

In common use, the word noise means any unwanted sound. The amplitude level of the undesired background noise is measured in terms of decibel.

How does a vacuum cleaner pick up dirt?

James Spangler, a janitor at an Ohio department store who suffered from asthma, invented his “electric suction-sweeper,” in 1907 as way of picking up the dust and debris that triggered his health condition.

Will a plant grow better if you talk to it?

Studies have shown that plants seem to grow better if they are talked to. But plants don’t have sound receptors or nervous systems, so scientists know that plants aren’t responding to the specific words people say.

What is the smallest living bird?

The smallest living bird is the bee hummingbird. Including its beak and tail, this bird measures only about 2 inches (5.5 centimeters) and weighs about two-thirds of an ounce (20 grams).

Why isn’t Pluto a planet anymore?

Pluto was once included in the list of planets, but is now considered a dwarf planet. Dwarf planet is an object in orbit around the Sun that is massive enough to have its own gravity to pull itself into a round (or nearly round) shape.

How did the universe begin?

Humankind has always puzzled over the origins of the universe. Scientists believe that the universe began with the Big Bang, a cosmic explosion that occurred between 10 and 20 billion years ago and threw matter in all directions.

Brown Recluse Spider-Range Could Expand in N. America With Changing Climate

One of the most feared spiders in North America is the subject a new study that aims to predict its distribution and how that distribution may be affected by climate changes. 

What Is Cancer?

What Is Cancer?

Cancer is the general name for a group of more than 100 diseases in which cells in a part of the body begin to grow out of control. Although there are many kinds of cancer, they all start because abnormal cells grow out of control. Untreated cancers can cause serious illness and even death.