Metal that is liquid at room temperature

We typically associate metals with being solid, heavy and structurally rigid.

But there is an exception.

Metal that is liquid at room temperature is Mercury,  Hg known as quick silver.

The reason why mercury stays liquid whereas its counterparts like gold and thallium are solids lies in quantum mechanics.

In mercury atoms, electrons move at incredibly high speeds. This causes the electrons to gain mass and pull closer to nucleus.

Outermost electrons are moved so tightly towards the center that they do not bond easily with other mercury atoms.

Because of this, attraction between mercury atoms is so weak that in room temperature also, atoms will be sliding past one another resulting in liquid state.

Mercury don't flow like water though it is a liquid  !!!

It has extreme high surface tension causing it to form silver beads, we are familiar with.

World's most import dependant countries

  These are the countries  ----

1.   Hong Kong

2.  Luxembourg 

3.   San Marino

4.   Singapore 

5.  Djibouti 

6.   Nauru 

7.  Seychelles 

8.  Ireland 

9.  Kiribati 

10.  Malta

11.  Somalia 

12.  Lesotho 

13.   Cyprus 

14.   UAE 

Why sprinkle water before dosa ??

  There is a very practical scientific reason for that quick splash of water !!!

The primary goal is to lower the surface temperature of the tawa quickly.

If the pan is too hot, the batter will cook the moment it touches the surface.  This makes it impossible to spread the batter into a thin circle. Batter just stick  to pan.

The reason behind this is as the water evaporates, it absorbs a significant amount of heat  from the metal.  It brings the temperature to a point where the batter can glide smoothly before setting.

The water droplets instead of just evaporating instantly, they will be dancing and skittering across the pan !!!

This is Leiden Frost effect.

When a liquid hits a surface significantly hotter than its boiling point, a thin layer of vapour forms between the liquid and the surface.

This vapour layer acts as an insulator, allowing the droplets to hower   !!!

After sprinkling the water, it is  important to wipe it off. Otherwise dosa will steam and become soggy..... 

When batter is applied to pan, batter don't get attached to pan. Also it will help the batter to spread making dosa crispier in the edges and smoother in the middle  !!!

Tallest animals of different species in the world

  Here is the list of tallest animals in the world   ----

1.   African elephant,  tallest in elephants 

2.  Moose,  tallest deer

3.  Ostrich, tallest bird

4.  Whale shark, biggest fish

5.  Brown Bear , tallest bear

6.  Lion's mane jellyfish,  largest jellyfish 

7.  Saltwater crocodile, largest reptile 

8.  Giraffe , tallest land animal 

9.  Blue whale , largest animal ever 

Why do human new born babies have more bones than adults ??

Many of the new born babies " bones " are actually seperate pieces of soft, flexible cartilage that gradually fuse together as they grow.

New born babies born with 270 to 300 " bones ", an adult skeleton has only 206 bones.

Having multiple, seperate skull bones allows the baby's head to compress slightly.  It helps in natural way of pregnancy.

Flexible spots between skull bones provide room for the brain to expand quickly during infancy.

Pliable skeleton helps the infants to absorb the effect of falls and tumbles while they try to learn crawling and walking.

As the person matures, calcium and other minerals harden the soft cartilage to solid bones.

Similar bone segments grow together to form single, larger and stronger structures. 

This is notable in skull, spine and pelvis regions.