YAWN!! Why we do it ?

A Cute baby Yawning

Even thinking about yawning can cause you to do it. It’s something everybody does, including animals, and you shouldn’t try to stifle it because when you yawn, it’s because your body needs it. It’s one of the most contagious, uncontrollable actions a body does.

There are many theories as to why people yawn.The most scientifically backed theory about why we yawn is brain temperature regulation. A 2014 study published in Physiology & Behavior looked at the yawning habits of 120 people and found that yawning occurred less during the winter. If the brain’s temperature gets too far outside of the norm, inhaling air can help cool it down.

You may also find yourself yawning more if you get migraines. During a migraine, your blood clots in your brain. Yawning helps to cool your brain down from that clotting.

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USES OF ELECTROMAGNETIC WAVES

USES OF ELECTROMAGNETIC WAVES

The following are some of the uses of electromagnetic waves

1. Radio waves are used in radio and T.V. communication systems.

2. Microwaves are used in microwave oven.

3. Infrared radiations are used

(a) in revealing the secret writings on the ancient walls

(b) in green houses to keep
the plants warm

(c) in warfare, for looking through haze, fog
or mist as these radiations can pass through them.

4. Ultraviolet radiations are used in the detection of invisible writing, forged documents, finger prints in forensic
laboratory and to preserve the food stuffs.

5. The study of infrared, visible and ultraviolet radiations help us to know through spectra, the structure of the molecules and arrangement of electrons in the external shells.

Our units of measurement are finally about to get an upgrade... THE NEW METRIC SYSTEM

Our units of measurement are finally about to get an upgrade

The new metric system

By the end of 2018, a kilogram will no longer exist as we know it, with our standard units of measurement finally scheduled to get a much-needed upgrade for the first time in more than 50 years.

Under the new proposal, all seven basic units of measurement - including the second, the kilogram, and the metre - will be defined by constant properties of nature, such as the speed of light, rather than by a value thought up by a bunch of scientists. And it's going to make the world a whole lot more accurate.

What is 20/20 or 6/6 vision ???

           

Visual Acuity test

Visual acuity measures our ability to see small detailed black objects on a white background, such as printed text.

☆ What does 20/20 or 6/6 mean?

☆ 20/20 and 6/6 (6/6 is the metric measure) only indicate how sharp or clear your vision is at a distance. 

Overall vision also includes peripheral awareness or side, eye coordination, depth perception, focusing ability and color vision.

What are Viruses ???

Viruses term is a latin word which means venom or poison.
Viruses are minute microorganisms much smaller than bacteria
(size ranges from 0.015 – 0.2 micron) and can be seen only with
the help of an electron microscope.
M.W. Beijerinck (1898) demonstrated that the extract of infected
plants of tobacco causes infection in healthy plants and called
the fluid as contagium vivum fluidum.
W.M. Stanley (1935) showed that viruses could be crystallised and crystals consist of proteins.

Characteristics of Viruses

• They are not free living.
• They grow and multiply only inside other living cells.

How to read a book without opening it...

Book lovers :-  Scientists have devised a way to read without cracking a volume’s spine or risking paper cuts (and no, we’re not talking about e-books).

The new method uses terahertz radiation — light with wavelengths that are between microwave and infrared waves — to view the text of a closed book.

The technique is not meant for your average bookworm, but for reading rare books that are too fragile to open.

The Orionids Light Up the Night...hope you enjoy the show..

October is a special month for astronomy lovers, because around this time every year, Earth passed through the tail of debris left behind by three different comets.

Right now, we’re cruising through the tail of Halley's comet, and the result is one of the best sky-watching events of the year - the Orionid meteor shower. This shower lasts until November 7, but don’t wait, because it’s about to hit its peak.

20 Amazing Science facts.. you didn't know !

20 Most Amazing Facts.

1. Your shoes are the first thing people subconsciously notice about you. Wear nice shoes.

2. If you sit for more than 11 hours a day, there's a 50% chance you'll die within the next 3 years

3. There are at least 6 people in the world who look exactly like you. There's a 9% chance that you'll meet one of them in yourlifetime.

4. Sleeping without a pillow reduces back pain and keeps your spine stronger.

5. A person’s height is determined by their father, and their weight is determined by their mother.

Winners of Nobel Prize 2016 (full list for competitive exams)

           

          Winners of Nobel Prize 2016

Three fundamental modes of heat transfer

HEAT  TRANSFER is the exchange of thermal energy between physical systems. The rate o of heat transfer is dependent on the temperatures of the systems and the properties of the intervening medium through which the heat is transferred. 

The three fundamental modes of heat transfer are CONDUCTION,  CONVECTION  & RADIATION. 

✔Thermal conduction

Thermal conduction is the transfer of heat (internal energy ) by microscopic collisions of particles and movement of electrons within a body. The microscopically colliding objects, that include molecules, atoms, and electrons, transfer disorganized microscopic kinetic and potential energy, jointly known as internal energy. Conduction takes place in all phases of matter, such as solids, liquids, gases and plasmas. The rate at which energy is conducted as heat between two bodies is a function of the temperature difference (temperature gradient ) between the two bodies and the properties of the conductive medium through which the heat is transferred. Thermal conduction was originally called diffusion.