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Synthetic glues like Elmer's are made of polyvinyl acetate (PVA) emulsions.The word emulsion refers to the fact that the PVA particles have been emulsified or suspended in water. The thinner the glue, the more water it has in it.
Source: https://www.reference.com/science/glue-made-eaa233a533e5c820#

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Source: Google

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Q: Why do cow's tongues feel like sand paper? Why are they so thick?

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Q: Why do cow's tongues feel like sand paper? Why are they so thick?

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A: Cows need their hard tongues to rip grass from the ground because they don't have front teeth on the top front of their mouth. Also, they need their thick, sturdy tongues to clean their young after being born.
Source: http://www.kidscowsandgrass.com/2011/02/cows-tongue-amazing-abilities.html

Image below to show that cows do not have front top teeth to grab grass with.

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A: When drugs enter the brain, they interfere with its normal processing and can eventually lead to changes in how well it works. Over time, drug use can lead to addiction, a devastating brain disease in which people can’t stop using drugs even when they really want to and even after it causes terrible consequences to their health and other parts of their lives.

Drugs affect three primary areas of the brain:

The brain stem is in charge of all the functions our body needs to stay alive—breathing, moving blood, and digesting food. It also links the brain with the spinal cord, which runs down the back and moves muscles and limbs as well as lets the brain know what’s happening to the body.

The limbic system links together a bunch of brain structures that control our emotional responses, such as feeling pleasure when we eat chocolate. The good feelings motivate us to repeat the behavior, which is good because eating is critical to our lives.

The cerebral cortex is the mushroom-shaped outer part of the brain (the gray matter). In humans, it is so big that it makes up about three-fourths of the entire brain. It’s divided into four areas, called lobes, which control specific functions. Some areas process information from our senses, allowing us to see, feel, hear, and taste. The front part of the cortex, known as the frontal cortex or forebrain, is the thinking center. It powers our ability to think, plan, solve problems, and make decisions.

Prescription drugs can cause dangerous short- and long-term health problems when they are not used as directed or when they are taken by someone other than the person they were prescribed for.

Abusing opioids like oxycodone and codeine can cause you to feel sleepy, sick to your stomach, and constipated. At higher doses, opioids can make it hard to breathe properly and can cause overdose and death.

Abusing stimulants like Adderall or Ritalin can make you feel paranoid (feeling like someone is going to harm you even though they aren’t). It also can cause your body temperature to get dangerously high and make your heart beat too fast. This is especially likely if stimulants are taken in large doses or in ways other than swallowing a pill.

Abusing depressants like barbiturates can cause slurred speech, shallow breathing, sleepiness, disorientation, and lack of coordination. People who abuse depressants regularly and then stop suddenly may experience seizures. At higher doses depressants can also cause overdose and death, especially when combined with alcohol.

Abusing depressants like barbiturates can cause slurred speech, shallow breathing, sleepiness, disorientation, and lack of coordination. People who abuse depressants regularly and then stop suddenly may experience seizures.

In addition, abusing over-the-counter drugs that contain DXM can also produce very dangerous effects.

Abuse of any of these types of medications can lead to addiction. And, abusing any type of drug that causes changes in your mood, perceptions, and behavior can affect judgment and willingness to take risks.

Prescription drugs can increase risk for health problems when combined with other prescription medications, over-the-counter medicines, illicit drugs, or alcohol. For example, combining opioids (painkillers) with alcohol can make breathing problems worse and can lead to death.

Source: https://teens.drugabuse.gov/drug-facts/brain-and-addiction

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Q: How many chromosomes are in an identical twin egg?

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Q: How many chromosomes are in an identical twin egg?

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A: I think this will answer your other question too, Adriana.

Identical Twins are born from a single sperm and egg. When these two gametes (another word for sperm and egg) fuse together a zygote (a zygote is an egg cell that has been fertilized by a sperm cell) is formed which starts division.

At Zygote two celled stage, where each cell has 46 Chromosomes, these two cells separate and undergo division independent of each other as if they are two separate Zygotes giving rise to Identical Twins and hence the Chromosome Number is maintained.
Source: Verywell.com
To look at a diagram of what normal fertilization looks like, click here

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A: Technically, yes. When a cell goes to reproduce, it sends a signal to the DNA (Chromosomes are just tightly coiled DNA) to copy itself so that the cell can split into two and have the same genetic information.

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A: New research has shown that a hormone that typically calms adults down actually makes teens feel anxious. A hormone called THP (or allopregnanolone) is released in our bodies during moments of stress. For adults, this hormone has a calming effect. In teens, the release of THP causes an increase in anxiety.

This reaction to the hormone THP tends to go away as teens approach adulthood, possibly contributing to fewer episodes of moodiness during stressful times.
Source: https://www.verywell.com/why-is-my-teen-so-moody-3200842

Hormonal changes are at work, too. The adolescent brain pours out adrenal stress hormones, sex hormones, and growth hormone, which in turn influence brain development. The production of testosterone increases 10 times in adolescent boys. Sex hormones act in the limbic system and in the raphe nucleus, source of the neurotransmitter serotonin, which is important for the regulation of mood.
As long as the brain is still in formation, things can go wrong in many ways, and some of them involve the onset of psychiatric disorders. Stress can retard the growth of the hippocampus, which consolidates memories.
Source: http://www.health.harvard.edu/mind-and-mood/the-adolescent-brain-beyond-raging-hormones

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Q: What do random muscle cramps come from?

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Q: What do random muscle cramps come from?

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A: The cause of muscle cramps isn't always known. Muscle cramps may be brought on by many conditions or activities, such as:

Exercising, injury, or overuse of muscles.

Exposure to cold temperatures, especially to cold water.

Other medical conditions, such as blood flow problems (peripheral arterial disease), kidney disease, thyroid disease, and multiple sclerosis.

Standing on a hard surface for a long time, sitting for a long time, or putting your legs in awkward positions while you sleep.

Not having enough potassium, calcium, and other minerals in your blood.

Being dehydrated, which means that your body has lost too much fluid.

Taking certain medicines, such as antipsychotics, diuretics, statins, and steroids.

Source: http://www.webmd.com/sleep-disorders/tc/nighttime-leg-cramps-topic-overview#1