Problem: I read this background article the other day: Old age begins in the mid-60s and lasts until the end of life. Most people over 65 have retired from work, freeing up their time for hobbies, grandchildren, and other interests. Stamina, strength, reflex time, and the senses all decline during old age, and the number of brain cells decreases as well. The immune system becomes less efficient, increasing the risk of serious illnesses such as cancer and pneumonia. Diseases such as Alzheimer's disease that cause loss of mental function also become more common. I am facing a new situation today: Ted had 2 uncles. Uncle Jerry was getting up there in age, he was 78 years-old. Uncle Tom was younger, he was in his early 50's and still very active and productive. Using the knowledge I acquired from the background article, how should I answer correctly the following question regarding my new situation: Which uncle didn't have a decreased reflex time?

A: Tom

Problem: I read this background article the other day: Individuals living in large groups may be safer from attack because the predator may be confused by the large group size. As the group moves, the predator has greater difficulty targeting an individual prey animal. The zebra has been suggested by the zoologist Martin Stevens and his colleagues as an example of this. When stationary, a single zebra stands out because of its large size. To reduce the risk of attack, zebras often travel in herds. The striped patterns of all the zebras in the herd may confuse the predator, making it harder for the predator to focus in on an individual zebra. Furthermore, when moving rapidly, the zebra stripes create a confusing, flickering motion dazzle effect in the eye of the predator. I am facing a new situation today: Two packs of lions were hunting large herbivores. The Simba pack was ambushing wounded individual prey animals, while the Mobutu pack followed large groups of zebras and other grazers. Using the knowledge I acquired from the background article, how should I answer correctly the following question regarding my new situation: Which pack was preying less upon herds?

A: Simba

Problem: I read this background article the other day: Chlamydia may cause a burning feeling during urination. It may also cause a discharge (leaking of fluids) from the vagina or penis. But in many cases it causes no symptoms. As a result, people do not know they are infected, so they don't go to the doctor for help. If chlamydia goes untreated, it may cause more serious problems in females. It may cause infections of the uterus, fallopian tubes, or ovaries. These infections may leave a woman unable to have children. I am facing a new situation today: At a doctor's office, two people come in to get STD tests. John comes in and reports the only symptom he has is a rash on his thighs. Patty says she has seen something leaking out of her vagina, and she's not sure what it is. The doctor takes a urine sample from each and will give them the results in a day or two. Using the knowledge I acquired from the background article, how should I answer correctly the following question regarding my new situation: Is John more or less likely than Patty to experience a burning sensation while urinating?

A: less

Problem: I read this background article the other day: Often, foreign exchange controls can result in the creation of black markets to exchange the weaker currency for stronger currencies. This leads to a situation where the exchange rate for the foreign currency is much higher than the rate set by the government, and therefore creates a shadow currency exchange market. As such, it is unclear whether governments have the ability to enact effective exchange controls.[1] I am facing a new situation today: In the beginning of this century there was scandal in the financial market regarding black market trading. A trader named Trader A was working for Bank A. He noticed country M has pegged its currency to a fixed price while country N did not do that. He opted to trade country M currency. Across the aisle his colleague trader B was working for bank B. He traded country N's currency. Using the knowledge I acquired from the background article, how should I answer correctly the following question regarding my new situation: Which country's currencey would most probably be traded in the black market?

A:
country M