12 Answers For Those Who Are Always After "How" And "Why!"

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We are constantly surrounded with questions about the mysteries of the earth. However, when it comes to doing research about those questions, we tend to be lazy. We gathered a list of 12 answers for the curious ones among you!

1. What does 24-carat Gold mean and why 24?

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The term carat is used to indicate the pureness of the gold. 24-carat gold is a gold that does not contain any other metals inside it. This means that this is 100% pure gold. Pure gold is actually really soft. That is the reason why it is blended with copper or silver most of the time. Each carat is corresponds to the 1/24 of the whole gold. For instance, the percentage of gold on a bracelet is 18/24 gold and 6/24 is silver.

This technique is developed to weigh the gold by Germans for over thousands years ago. Germans used a currency named Mark and these changes weighed around 4.8 grams. This amount was equal to 24-carats in diamond currency.

2. Why don't we find ourselves attractive in photos?

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We tend to see ourselves from the mirror, which is the reverse reflection of ourselves. Since we get used to seeing ourselves in reverse, the look of ourselves might seem strange to us at first glance. However, it is actually the way the others see us. That is the reason why other people tend to like our photos more than us, since this is what they are seeing.

3. How does a thermos work?

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The scientific explanation of thermos bottles is the entrapped air inside of them. These bottles have two different layers. When these bottles are produced, the air between those layers is vacuumed. The thermos bottle keeps the heat of things inside of it in order the keep the temperature stable. The air causes things to cool and when you remove the air by vacuuming, you can keep the temperature stable.

4. What are northern lights (Aurora Borealis) and what causes them?

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The Northern Lights are actually the result of collisions between gaseous particles in the Earth's atmosphere with charged particles released from the sun's atmosphere. Variations in color are due to the type of gas particles that are colliding. The most common aurora color, a pale yellowish-green, is produced by oxygen molecules located about 60 miles above the earth. Rare, all-red auroras are produced by high-altitude oxygen, at heights of up to 200 miles. Nitrogen produces blue or purplish-red aurora.

5. How are glass marbles made?

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In the ancient times, glass marbles were made by either rolling clay or engraving elephant tusks. Nowadays, glass marbles are made by melting glass, rolling it into sticks, and cutting it into pieces with special scissors. Most marbles are produced after an industrial process.

Check out this video below to see for yourself: 

Video

6. Why does our jawline shake when we are afraid?

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Humans inherited a lot from the people who lived in the stone age. Our reactions against dangerous situations are still the same. When a person encounters a dangerous situation, their body immediately prepares for a defense. The body chooses which muscles to use in order to prepare its defense. Like many other animals, the jaw and teeth are the main mechanisms of defense in our bodies. This is the reason why when a dangerous situation occurs, the jaw line takes its precaution by instinct. The muscles on the jaw start to shake and the teeth seems like they are crashing.

7. Why do race bikes have thinner tires?

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This can be explained by a simple physics principle. It's important to increase the force of friction to go faster. This is also related to the pressure applied on the surface. Thinner wheels are lighter in weight and have less inertia momentum. This is the reason bikes can go much faster with thinner wheels.

8. Why is flour dangerous for your health?

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It would be hard to believe when someone tells you that flour has a flammable property. In 1981, a deadly incident happened in the USA where 9 people died and 30 people were injured after a flour warehouse exploded.

The amount of carbohydrates in the air becomes explosive if the amount surpasses 50 gr/m3. The grains of the flour are so tiny that they burn immediately if they ignite by any chance. This explosion becomes widespread and it could even collapse a building if the pressure is not discharged. Don't worry about the flour you keep in your cupboard, though. You need tons and tons of flour for this explosion to happen.

9. Why do circus tents have a circular shape?

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Philip Astley is considered to be the founder of the modern-day circus. When Astley founded the circus in 1763, the main show was done by horses. Astley noticed that it was easier for the riders to stand on the horses when they have a circular setting for the tent. Another circus owner, Antonio Franconi, calculated the ideal number for the diameter of the tent, which is around 13 meters. This measurement is still used today.

A final note on the subject- the word circus is derived from the latin word for "circle."

10. Why do wheels seem like they are moving in reverse?

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The reaction time of our eyes is between 1/5 and 1/30 of a second. If our reaction time collides with the spinning wheel's angular speed, each overturn overlaps and it would seem like the wheel is not moving at all. If the angular speed is slightly slower than the reaction time, there won't be any overlaps and the wheel would seem like it is spinning the other way around.

11. Why are water dispenser bottles 19 liters?

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Water dispenser bottles originated in the USA and they have a different unit of measurement. In the States, the liquid measurement unit is gallon. 1 gallon is approximately equal to 3.8 liters. A water dispenser bottle holds around 5 gallons and that is 19 liters.

12. Why do older people have huge ears?

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There are three types of cartilage in our bodies: Hyaline, Elastic and Fibro. The tissues in our ears are composed of collagens and elastines. Both of these are flexible tissues. As we get older, these elastic tissues lose their flexibility and start to dangle. This means that this is a growth caused by the changing tissues. Moreover, as the nose and lips starts to get smaller by losing tissues for the same reason, the ears tend to seem bigger.

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