On the relationship side, if you teach people to respond actively and constructively when someone they care about has a victory, it increases love and friendship and decreases the probability of depression.
There may be aliens in our Milky Way galaxy, and there are billions of other galaxies. The probability is almost certain that there is life somewhere in space.
Probability is expectation founded upon partial knowledge. A perfect acquaintance with all the circumstances affecting the occurrence of an event would change expectation into certainty, and leave nether room nor demand for a theory of probabilities.
If we have an atom that is in an excited state and so is going to emit a photon, we cannot say when it will emit the photon. It has a certain amplitude to emit the photon at any time, and we can predict only a probability for emission; we cannot predict the future exactly.
Psychology helps to measure the probability that an aim is attainable.
The 50-50-90 rule: Anytime you have a 50-50 chance of getting something right, there's a 90% probability you'll get it wrong.
In all probability, when the 1919 series is over, a diagnosis of it will show that the final result was brought about by some unusual situation or freak happening that was given no consideration when the relative strength of the two clubs was considered.
Failure saves lives. In the airline industry, every time a plane crashes the probability of the next crash is lowered by that. The Titanic saved lives because we're building bigger and bigger ships. So these people died, but we have effectively improved the safety of the system, and nothing failed in vain.
Medicine is a science of uncertainty and an art of probability.
Fourth Law of Thermodynamics: If the probability of success is not almost one, then it is damn near zero.