There are approximately 6.3 billion (6,300,000,000) human beings on the Earth at the present moment.
Imagine that each person on the planet is given a coin which is scrupulously calibrated to be absolutely fair, equally likely to come up heads or tails. (Persons who are neurologically undeveloped, damaged, or ill will have a coin flipped on their behalf by a family member or neighbor.) At exactly midnight, GMT, everyone flips his or her coin and records the outcome (heads or tails). Then the process is repeated again at 12:02 AM, and 12:04 AM, and so forth, every two minutes, until every coin has come up heads at least once and tails at least once, at which point the coin-flipping stops.
What time is it (GMT) when the coin-flipping stops?
Answer in comments.
Activity: How many times will the last coin-flipper have seen his/r coin come up either all heads or all tails? Is s/he likely to believe that the coin is fair and unweighted? Divide into small groups and discuss the emotional impact of this exercise on the coin-flipper if A) s/he is inclined to be skeptical of the claims of others or B) s/he is inclined to assign religious meaning to the exercise.
How would you defend the fairness of the coin to the skeptic in A)?
How would you explain to the believer in B) that s/he had not been singled out for special treatment by a deity, that inevitably a long string of H or T outcomes was going to happen to somebody?