rockets

A rocket is a device for trading mass for speed. The generic (i.e., gravitationally neutral) mathematical model of this is the equation p = qlog(m(i)/m(f)), where p is the increase in speed, q is the rate of loss of mass (that is, of mass ejection, assumed to be constant over the time interval in question), m(i) is the initial mass of the device (that is, of the rocket), and m(f) is the final mass of the device (that is, what mass remains after the mass to be ejected has been in fact ejected). This equation was published in 1903 by Konstantin Tsiolkovsky 23 years before Robert H. Goddard’s first liquid-fuel rocket was launched in 1926.
Notice how that fact that the logarithm of unity is zero neatly captures the fact that if no mass is ejected, then there is no increase in speed.
Here is the Wikipedia article on this equation.
keywords: Mathematics, Physics, ideal rocket equation, Tsiolkovsy rocket equation

The Birthday Problem

There is a famous problem in Probability Theory that is phrased in terms of birthdays: What is the smallest number such that a randomly selected group of people of that number will have the same birthday (that is, month and day, ignoring the phenomenon of leap years)? People guessing the answer usually greatly over-shoot the mark. The number is surprisingly small: 23. This answer is so counter-intuitive that the ‘birthday problem’ is sometimes referred to as the ‘birthday paradox’.
Here is the Wikipedia article on this.

the power of story (aka the power of words)

Here is an iconic video about that.
However, that iconic video does not tell the whole story (no pun intended). The power of story is really a special case of a supportive mls. The mls always trumps the gls. The mls and gls can have an angle ranging from 0 to 90 degrees, where an angle of 0 degrees means that the mls is supportive of the gls, and an angle of 90 degrees means that that the mls is flatly contradicting the gls. To tell a story is to launch an mls supportive of the relevant gls. (Hence, ‘here-and-now stories’ is mostly a pleonasm.)
keywords: general life situation (gls), momentary life situation (mls), It’s a beautiful day and I can’t see it.