The website shows you a hand of 5 cards, and asks you to pick one card and stare at it intensely. It claims it will read your mind and guess the card. When ready, you will click a button, and 5 new cards are shown - 4 random cards plus the card you thought of.
The trick is that the same cards are shown as before, but in different order. Most people only focused on the one card and don't notice that the rest of the cards are the same. It sounds very simple, but it worked on me and all my family members, at least the first time.
The logical and mathematical analysis later in the article looks more detailed, but unfortunately the initial, fundamental, description of the process lacks clarity and forces us to guess the details
Once you pour a liter of the new, mixed, wine-water substance back into the first container, you’ll likely have less than a liter in the second container, so the wine bottle will contain more than the container originally containing water. Right?
There must a 100+ of these types of tricks or algo's
This is such a ridiculously obvious trick I'm surprised any audience is impressed by it. But that happens for me with a lot of magic tricks... I guess a lot of people just choose to shut off basic thinking (and in this case don't have an intuitive understanding of conserved quantities).