if you get a million people to flip a coin 50 times. Some of them will get all 50 to be heads.

Flipping a coin 50 times has 1.1 quadrillion possible outcomes, only 2 of which are all heads or all tails. I think you’d need more than a few billion to reliably see those results.

Lasik surgery exists and isn’t all that expensive, but you still see plenty of people with glasses.

Greywater (or grey water, sullage, also spelled gray water in the United States) refers to domestic wastewater generated in households or office buildings from streams without fecal contamination, i.e., all streams except for the wastewater from toilets. Sources of greywater include sinks, showers, baths, washing machines or dishwashers.

https://en.wikipedia.org/wiki/Greywater

The ad was in Farsi, so that checks out. Maybe they’re assuming Iranians are trying to learn Arabic because basically every country around them does?