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What causes communicable diseases?
Communicable diseases are diseases that are typically very dangerous and very contagious. Usually, diseases of this kind are spread by one person that catches the illness and unknowingly gives it to others.
Where can one find facts about osteonecrosis?
The National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS) is a great resource for learning about osteonecrosis. It answers many common questions about osteonecrosis.
What makes perfect circles in the ground?
you can take a thin stick or other cylindric object and jab it into the ground. it has to be stiff. now take some string and tie one end around the stick so it would hang a little loose. on the other end attach another stick, but don't stick it in the ground. Now pull the string in one direction until its tight, but the stick not in the ground onto the ground and walk around in a circle, always keeping the string taught.
What is the nearest one unit?
The ones place is immediately to the left of the decimal point. The phrase "to the nearest one" means to round a number to that targeted place. When rounding to a specific place, take a look at the digit immediately to the right of the target, in this case, the tenths place. If that digit is 4 or less, zero everything to the right of the target out. If that digit is 5 through 9, increase the target by one and zero everything to the right of it out. If the target is a 9, increasing it will turn it to zero and increase the digit to the left of the target by one.
What are the odds of having a baby with 3 very rare diseases?
If you know nothing about the parents' risk for these diseases or other contributing factors (race, environment, etc.), then the answer depends solely on the probabilities of getting any one of those diseases. Let's say the risks are P1, P2 and P3 where P1 is the probability of the baby having rare disease #1 and so on. A probability of 1 is a sure thing and 0 means no chance, so the probability of a rare disease is a number slightly greater than 0. The risk of getting disease #1 AND #2 AND #3 is the product: P1xP2xP3. If, for example, the each risk is one in a million (P1=P2=P3=0.000001), then the odds of having a baby with all three is 1 in 1,000,000,000,000,000,000. The math changes severely if one of the parents is at risk for the disease. Let's say the mother has one gene that causes the disease #1. Then P1 is no longer 1 in a million, it is 0.5. If the parent's racial group is afflicted with P2=0.001 as well, then P=0.5x0.001x0.000001=0.000000005, which is 500,000 the risk of others.
