... the number of days in a week? I mean have you ever though of doing something twice a week with equal time intervals between each day? Or maybe three times a week or four times. It's impossible, now my question is why choose 7 days to determine a weekly cycle? Those early Christians didn't put much thought in prime numbers because if they did, they would've recognized it as a prime and chose a different one. The Sumerians were much smarter, they used multiples of 12 (actually it was a hexadecimal base): think about it: 60 = 5 * 12 seconds in a minute, 60 minutes in an hour, 24 hours in a day, 12 months in a year, (almost) 360 = 60 * 60 days in a year.
The cool thing about 12 is that a lot of divisors. You can divide it equally by 2, 3, 4, and 6. Giving you lots of options to partition your week. So, if you ask me, God should have created the Earth in 12 days
... when you are tired and want to go to sleep, but you can't because you're anxious about something and finally when you fall asleep you have one of those weird dreams in which you stumble and have a sensation of falling and then wake up, with your whole body twitching?
... (this one only applies of you generally read science magazines) articles that always give an introduction to subjects a little more advanced like 'special relativity' or 'uncertainty principle' but it's always the same thing you heard time and time again. People that read that kind of stuff, generally know what those subjects are and if they didn't they would search the Internet, find out and then return. You don't need to introduce things like what causes earthquakes each time you have an earthquake-related article for example.