Today I Learn

06 Nov 2024 00:30

Can graphite conduct electricity?

Graphite is an electric conductor, consequently, useful in such applications as arc lamp electrodes. It can conduct electricity due to the vast electron delocalization within the carbon layers (a phenomenon called aromaticity). These valence electrons are free to move, so are able to conduct electricity.

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04 Nov 2024 00:59

​​What is GPS? How does this work?

The Global Positioning System (GPS) is made up of satellites, ground stations, and receivers.
GPS is a system of 30+ navigation satellites circling Earth. We know where they are because they constantly send out signals. A GPS receiver in your phone listens for these signals. Once the receiver calculates its distance from four or more GPS satellites, it can figure out where you are.
Satellites act like the stars in constellations—we know where they are supposed to be at any given time.
The ground stations use radar to make sure they are actually where we think they are.
A receiver, like you might find in your phone or in your parents car, is constantly listening for a signal from these satellites. The receiver figures out how far away they are from some of them.
Once the receiver calculates its distance from four or more satellites, it knows exactly where you are.

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31 Oct 2024 04:40

What country does the Sahara Desert cover?

Oases support some life forms in extremely arid deserts. The Sahara covers large parts of Algeria, Chad, Egypt, Libya, Mali, Mauritania, Morocco, Niger, Western Sahara, Sudan and Tunisia, extends over 9,000,000 km² (over 3,475,000 sq mi) and it covers about 1/4 of the African continent.

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28 Oct 2024 11:02

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Today I Learn

25 Oct 2024 02:28

What part of the body is known as the voice box?

The vocal folds, also known as vocal cords, are located within the larynx (also colloquially known as the voice box) at the top of the trachea. They are open during inhalation and come together to close during swallowing and phonation.

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23 Oct 2024 06:03

How long does the food stay in your stomach?

After you eat, it takes about six to eight hours for food to pass through your stomach and small intestine. Food then enters your large intestine (colon) for further digestion, absorption of water and, finally, elimination of undigested food.

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21 Oct 2024 03:54

When was glass first made?

Archaeologists have found evidence of man-made glass which dates back to 4000 BC; this took the form of glazes used for coating stone beads. It was not until 1500 BC that the first hollow glass container was made by covering a sand core with a layer of molten glass.

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19 Oct 2024 03:01

What part of the plant is a carrot?

When we eat corn or peas we are eating seeds, and when we eat radish or carrot, we are eating roots. Cauliflower and broccoli plants produce flowers we like to eat. Potatoes grow under- ground, but the part we eat is not a root.

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17 Oct 2024 01:13

Why does water bubble when it boils?

The solubility of gases decreases when the temperature is raised, and that why the dissolved air bubbles out from the water. Then, as the boiling point of water is reached (100 degrees Celsius or 212 degrees Fahrenheit), water vapor starts to form inside the liquid in the form of bubbles.

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15 Oct 2024 02:12

Which sea on the Earth has no beaches?

The Sargasso Sea, The Sea Without A Shore. The Sargasso Sea is located in the middle of the Atlantic Ocean, just a little north of the equator. The water in the Sargasso Sea is one of the clearest in the ocean, with underwater visibility of up to and incredible 200 feet.

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13 Oct 2024 03:52

What time period are we in?

In geochronology, an epoch is a subdivision of the geologic timescale that is longer than an age and shorter than a period. We are currently living in the Holocene Epoch of the Quaternary Period. Rock layers deposited during an epoch are called a series.

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11 Oct 2024 04:27

Who first proposed the theory of evolution by natural selection?

In the early 19th century, Jean-Baptiste Lamarck proposed his theory of the transmutation of species, the first fully formed theory of evolution. In 1858, Charles Darwin and Alfred Russel Wallace published a new evolutionary theory that was explained in detail in Darwin's On the Origin of Species (1859).

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09 Oct 2024 00:56

Who was the designer of the Olympic rings?

The primary symbol of the Olympic Games is composed of five interlocking rings, colored blue, yellow, black, green, and red on a white field, known as the "Olympic rings." The symbol was originally designed in 1912 by Baron Pierre de Coubertin, co-founder of the modern Olympic Games.

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07 Oct 2024 05:39

How many moons does Mars have?

Mars has two moons, Phobos and Deimos, which are thought to be captured asteroids. Both satellites were discovered in 1877 by Asaph Hall and are named after the characters Phobos (panic/fear) and Deimos (terror/dread) who, in Greek mythology, accompanied their father Ares, god of war, into battle.

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05 Oct 2024 02:37

What countries border the Black Sea?

The Black Sea is an inland sea located between far-southeastern Europe and the far-western edges of the continent of Asia and the country of Turkey. It's bordered by Turkey, and by the countries of Bulgaria, Romania, Ukraine, Russia and Georgia.

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04 Nov 2024 22:44

What is your tongue attached to?

The hyoid is anchored by muscles from the anterior, posterior and inferior directions, and aids in tongue movement and swallowing. The hyoid bone provides attachment to the muscles of the floor of the mouth and the tongue above, the larynx below, and the epiglottis and pharynx behind.

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01 Nov 2024 01:07

Can you kill bacteria by freezing?

Freezing foods renders bacteria inactive but doesn't actually kill anything. That means if your food went into the freezer contaminated, once thawed it will still harbor the same harmful bacteria. Cooking it to the recommended temperature is the only way to ensure that your food is safe.

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29 Oct 2024 02:59

How many teeth does an elephant have?

Elephants usually have 26 teeth: the incisors, known as the tusks, 12 deciduous premolars, and 12 molars. Unlike most mammals, which grow baby teeth and then replace them with a single permanent set of adult teeth, elephants are polyphyodonts that have cycles of tooth rotation throughout their lives.

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27 Oct 2024 05:19

Do frogs have ears?

Frogs can hear both in the air and below water. They do not have external ears; the eardrums (tympanic membranes) are directly exposed or may be covered by a layer of skin and are visible as a circular area just behind the eye.

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24 Oct 2024 01:55

What kind of animal is a platypus?

The platypus (Ornithorhynchus anatinus) also known as the duck-billed platypus is a semiaquatic egg-laying mammal endemic to eastern Australia, including Tasmania. Together with the four species of echidna, it is one of the five extant species of monotremes, the only mammals that lay eggs instead of giving birth.

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22 Oct 2024 06:52

Is grass a monocot or a dicot?

Monocots: Plants with a single cotyledon or seed leaf. Leaf blades usually have parallel venation. Monocots may be grouped as grasses, sedges, or lilies.

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20 Oct 2024 14:38

How long does a migraine usually last?

Migraines are disabling headaches that most likely stem from problems with the nerves and blood vessels in the head. Migraine headaches typically last from 4-72 hours. They may occur as often as several times a week to only once a year. People who have migraines are called migraineurs.

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18 Oct 2024 14:08

What animal can live after being frozen?

Wood Frogs Can Survive Being Frozen Solid, Over and Over. Every autumn, the sanest animals head south, fleeing the encroaching winter lest they freeze to death or get torn apart by yetis.

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16 Oct 2024 00:24

What magnification do you need to see bacteria?

At 400x magnification you will be able to see bacteria, blood cells and protozoans swimming around. At 1000x magnification you will be able to see these same items, but you will be able to see them even closer up.

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14 Oct 2024 01:51

How much does the temperature change with altitude?

Although the actual atmospheric lapse rate varies, under normal atmospheric conditions the average atmospheric lapse rate results in a temperature decrease of 6.4C°/km (3.5F°/1,000 ft) of altitude above ground level. The measurable lapse rate is affected by the moisture content of the air (humidity).

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12 Oct 2024 04:29

Which is the largest carnivorous land animal?

Today's large carnivorous land mammals, including the record-setting polar bears—which usually weigh around half a ton but can grow to weigh nearly a ton, are threatened in part because of the energy intake-and-expenditure equation, Carbone told LiveScience.

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10 Oct 2024 03:47

Do frogs have ears?

Frogs can hear both in the air and below water. They do not have external ears; the eardrums (tympanic membranes) are directly exposed or may be covered by a layer of skin and are visible as a circular area just behind the eye.

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08 Oct 2024 04:41

Are genes located on chromosomes?

In genetics, a locus (plural loci) is the specific location of a gene, DNA sequence, or position on a chromosome. Each chromosome carries many genes; humans' estimated 'haploid' protein coding genes are 20,000-25,000, on the 23 different chromosomes.

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06 Oct 2024 03:46

Which planet has the hottest surface temperature?

Venus, the second closest plant to the Sun, has the highest average temperatures of any planet in our Solar System, regularly reaching temperatures over 460°C. Venus is so hot because of its proximity to the Sun and its thick atmosphere.

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04 Oct 2024 08:13

Can babies breathe through their mouths?

Newborns are "obligate nose breathers." This means they can't breathe through their mouths in the first few months of life. Because babies have small nasal passages, they sound stuffy when they breathe.

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