Q: Testosterone is responsible for the production of male sexual characteristics and functions, including a deep voice, facial hair, and denser bone and muscle mass. It is directly related to erectile functions, penis and testicular size, and the sex drive. Testosterone is also involved with the production of red blood cells and sperm. Normal levels of testosterone help to prevent high blood pressure and heart attacks. Low levels of testosterone may represent normal male aging; however, low levels of testosterone are also associated with a number of different health issues in men, as well as an increased risk of death. Testosterone levels vary in different men, so it can be difficult to determine if the levels detected in one man are too low or if they represent a normal decrease with age.  It is quite normal for a man’s testosterone level to decrease gradually with age. It is also quite normal to have fewer erections as a man ages. It is not normal, however, to be unable to have or sustain an erection, and it is not normal to lose interest in sex. This can be a symptom of many other, more common cases as well, including diabetes and depression. Though low testosterone is normal, levels that are too low can lead to many health problems. Symptoms of low levels of testosterone in men include:  Problems with sexual function. This can include erectile dysfunction, decreased desire for sexual activity, and a decrease in the number and quality of erections. Smaller testes Emotional problems, such as depression, irritability, anxiety, problems with memory or concentration Sleep disruption Increased fatigue or a general overall lack of energy Body changes, such as increased belly fat, decreased muscle mass, decreased strength and endurance, decreased cholesterol levels, and osteopenia (softening of the bones) and osteoporosis (decreased bone density) Swollen or tender breasts Loss of body hair Hot flashes Women can have low testosterone as well. Symptoms of low testosterone in women include decreased sexual desire and function, muscle weakness, decreased vaginal lubrication, and infertility. To diagnose low testosterone levels, your physician will perform a physical exam and take a blood sample to test for testosterone levels. Depending on your physical exam, your symptoms, and your history, other tests may be performed as well. These tests check for thyroid function, diabetes, high blood pressure, and heart disease. If you are experiencing any of the symptoms, call your physician to have your testosterone levels tested. For those individuals who do choose TRT, you should know about potential side effects. Because of these potentially serious side effects, your physician will be most likely asking you to come in frequently for checkups. This may be every three to six months. You should also keep track of any changes in your body and report them immediately to your physician. The side effects include:  Increased risk of heart attacks and heart disease Increased risk of strokes and blood clots Increased risk of prostate cancer Sleep apnea Polycythemia, or increased levels of red blood cells — this causes the blood to get thicker and increases the risk of blood clots. Enlargement of male breasts Acne and oily skin Changes in hair patterns Decrease in the size of testicles Changes in cholesterol and blood lipid levels Testosterone replacement therapy (TRT) is not for every man. There are circumstances in which it is not recommended. For example, TRT is not recommended for men with sleep apnea, a high red blood cell count, congestive heart failure, or prostate conditions, such as benign prostatic hypertrophy, prostate cancer, or breast cancer.
A: Learn the importance of testosterone. Understand why low testosterone levels occur. Know the symptoms of low testosterone. Diagnose testosterone levels. Know the side effects of TRT. Understand when not to take testosterone.

Article: Education is not the most important part of learning proper English by any means, but people with extensive educations do often have a strong grasp on the rules of grammar and syntax. Speak to well-educated people, like your teachers,  your family members, or even nice strangers to hear what English is supposed to sound like. Try to mimic how these people speak. It may feel strange or awkward at first, but with practice it will become second nature. English speakers who are recording their voices will pay extra attention to their pronunciation and how they are saying a word. Read along with an audiobook to see how each word is pronounced, or listen to an educational podcast for a more conversational tone. You can even stop the recording and repeat new words until you get them right. A common mistake many native and non-native English speakers make is not pronouncing the endings of words. Try over-enunciating the endings of words at first, then relax a little. Dropping the ends of words makes the language more informal, since some of them can be versions of slang words. For instance, instead of saying "goin’,” say "going.” Instead of saying "makin’," say "making.” To practice your pronunciation and moving from word to word quickly as you speak, say some tongue-twisters to yourself once a day. Practice ones that rely heavily on different letters and pronunciations so that you get a well-rounded practice.  Common tongue-twisters include: “Sally sells seashells down by the sea shore.” ”Peter Piper picked a peck of pickled peppers.” ”How much wood would a woodchuck chuck if a woodchuck could chuck wood?” Tongue-twisters are notoriously difficult to say, even for native English speakers. Don’t get discouraged if it takes some practice to get these right.
Question: What is a summary of what this article is about?
Speak to educated English-speakers. Listen to podcasts and audiobooks. Pronounce the endings of words. Practice tongue-twisters.

Q: The most common cause of popeye is dirty water, and the best form of prevention is frequently replacing the dirty tank water with fresh water. Always have clean water in the betta’s fish tank or bowl to ensure that it won’t get popeye.  If your betta is kept in a bowl or tank that holds two gallons of water or less, do a 50% water change every week. If your betta is kept in a larger aquarium, change 10-25% of the total water every 2–4 weeks. Clean the tank every week if you don’t have a filter and every two weeks if you do.  Gently remove your betta fish with a net and place it into a separate clean bowl of water. Dump out all of the water in the fish tank, remove all rocks and decorations, and rinse them with clean water. Using a paper towel, scrub the inside walls of the tank. Put the rocks and decorations back in the tank and fill the tank most of the way with bottled drinking water or pretreated tap water before putting your betta fish back in. The natural habitat for betta fish is warm, stagnant water. Make sure the water is kept between 76 and 82 degrees Fahrenheit (24.4-27.7 degrees Celsius) in order to provide a healthy environment for your fish. Use paper pH test strips to test how basic or acidic your betta’s water is. The pH should be kept at 6.5 or 7.  If the pH is too high, filter water through peat moss before putting it in the tank. If the pH is too low, add baking soda or shells to the tank. Bettas prefer soft water, so keep the dH at 25 or lower. Go to a pet store to get specialized products that can extract the magnesium and calcium from your water if it is too hard. Different fish require different environments, so make sure that you don’t add any fish to your tank that have conflicting environmental needs. Popeye often occurs when the tank water is not kept at the proper levels, and adding a new fish that thrives in a different kind of ecosystem might throw off those levels.
A:
Change the water regularly. Clean your fish tank every 1–2 weeks. Keep the tank water warm. Keep the tank water slightly acidic. Purchase a dH kit to determine water hardness. Carefully introduce new fish to the fish tank.