Why People say Hello on Phone?

Wikimedia Commons by Unknown

While making or receiving a telephone call, we often say hello in the very beginning. It has become a tradition throughout the world. But why this word is used. The answer is more surprising, as Hello was the name of some person.

The name of the beloved of the scientist Alexander Graham Bell was Hello. Her complete name was Margret Hello, while Hello was her nick name.

It was Graham Bell who invented the telephone. Whenever he made a call to his beloved he used to say hello. Since then the word became popular.

The people may not know that who invented telephone but the word hello is well known. It was Graham Bell who invented the metal detector too. It is now being used in the world for security purposes.

Why the Bats Hang Themselves Upside Down

                  The Bat hanging on a branch

                      Wikimedia Commons 

The bats are often seen hanging themselves upside down on trees. The bat could not be seen standing or sitting upright.

The reason behind this topsy-turvy position is the weak bones. The bones of feet of bats are so weak that they could not bear the weight of their body.

When the bats are on ground they put their entire weight on the ground and just lie down. In this way the feet are saved from carrying their weight.

That is why the bats get themselves hung on the branch of the tree, so that the body weight is not on bones but on the stretched or taught muscles and tissues. The bats hang in this position to save the bones of their feet. 

Why the Spider Does Not Get Trapped in its Web

The spider walking on straight threads
Wikimedia Commons by John Allan

The spider makes a web from the sap which comes out of its glands.

These special glands are located in the spinneret organ located in the underside or rear of the abdomen of the spider or the caterpillar.

A spider has two or three spinnerets. 

The spinneret is the silk spinning organ from where the spider ejects a liquid through long ducts leading to very small or microscopic spigots.

The spiders have two or three spinnerets.

The liquid coming out of the spinnerets gets hardened outside the body of the spider and gets transformed into a strong fiber.

These fibers are used to form the web. 

The web has two types of fibrous elements. 

The dry fiber makes the frame of the web. The spokes or cross lines of the web are made of a sticky fiber which traps the insects. 

The spider walks over the dry fibrous frame to reach the trapped insect and that is why the spider does not get trapped in its own web.

On the other hand the body of the spider is naturally coated with an oily layer which minimizes its chances of getting trapped in its own web.