If I tell you that I will give you a billion dollars, but I ask you to count it first dollar by dollar, would you accept the offer? Most people will say yes. If one starts counting now, and assuming that each number takes one second to count, it will take more than 33 years to count a billion nonstop without sleep and time out to eat. This of course, is impossible to do. How about a number like 6.02x1023 (Avogadro's number)? If all people on Earth start counting now, they will never be able to finish counting this number in one lifetime. This shows how big that number is, and yet it is the number of hydrogen molecules in only two grams of hydrogen gas. Extreme, isn't it? The hydrogen molecule must be very small. It is hard to imagine that by the time you close your eyes and open them (say 0.1 s), the electron makes more than 6.5x1015 revolution around the proton in the hydrogen atom, the light travels a distance of 30 kilometers, and all people on Earth move an average distance of 23 m. Do you believe what you see? You will say "certainly," but wait. If we look up in the sky and see a bright star, is that star there? Maybe! Maybe not! That star may have already vanished or collapsed and yet we just see it now. The light from this star, which we see now, may have taken billions and billions of years to reach the Earth, and during that time the star may have disappeared. So we see things that aren't really there. To illustrate this phenomenon, we assume that the King sends a messenger to a far away place that takes a month to reach. While the messenger is on his way, the King dies. When he arrives, everyone in that far away place knows that the King is alive. Science introduces us to numbers beyond belief. Large numbers like Avogadro's number, and small numbers like Planck's constant (6.63x10-34). These numbers are only good in terms of science, but beyond that they serve no other purpose. The average person can go on with his life, unaffected, without knowing anything about these numbers. Extremes in numbers lead us to hard-to-believe facts: The size and age of the universe, the size and mass of the electron, black holes, mass-energy formula. These are all hard-to-believe, yet proven, facts in science. This unit will address extremes in numbers, and address some of the hard-to-believe science facts. A lot remains to be discovered and written about by the students.