ALS typically claims lives within 2–5 years, yet Stephen Hawking lived with it for 55. Here's what makes the disease fatal and why he was an exception.
T statistics vary more than z-scores because they divide by an estimated standard deviation, adding extra randomness that creates heavier tails in small samples.
Endoscopy frequency for gastritis depends on severity. Most mild cases don't need repeats, while atrophic gastritis typically calls for monitoring every 3 years.