Have you ever wondered what all blue-eyed people have in common, aside from their stunning irises? It turns out, this rare eye color comes with a fascinating genetic history – and some unexpected superpowers.
While brown eyes may be the most common around the world, blue eyes are the second most popular. But the story behind this unique trait is anything but ordinary. In fact, evidence suggests that all blue-eyed individuals can be traced back to a single ancestor who lived between 6,000 to 10,000 years ago.That’s right – every single person blessed with those mesmerizing azure orbs shares a common genetic mutation that “turned off” the ability to produce brown pigment in the iris. This ancient switch has left blue-eyed folks with some surprising advantages…and disadvantages.
One of the most well-known quirks of blue eyes is an increased sensitivity to light. While those with darker irises have more melanin to protect the delicate tissues at the back of the eye, blue-eyed individuals lack this natural shield.
Many people get it wrong: Can you solve this tricky math problem?Seems easy but is not.. Check the comments
Challenge: Can you solve this math problem for middle schoolers – without a calculator?
Classic brain training methods are perhaps puzzles like crosswords or sudoku, but I have recently become more attracted to the type of challenge you’ll see below.
These puzzles have been flooding the web lately, probably because they are really fun!
These are old classic mathematical problems. When you were in middle or high school.
These math problems are more fun when you find yourself trying to remember the math you learned as a child.
Can you figure out the correct solution?
Here is the challenge, in the picture below.
At the top of the picture, we see the task and then four possible answers.
Which solution do you think is the correct one?
How did you come up with it?
Take your time and think about it to find the correct solution.
Done? Below you can check if you picked the right number!
A
B
C
The correct answer
The correct answer is B: 12.
Why is 12 the correct answer?
Well, if you remember from your school days, according to the order of operations, you do multiplication before addition and subtraction, so you start by solving 3 x 3, which results in 9.
Then we are left with a simpler math problem: 3 + 9 – 3 + 3
The answer is therefore 12.
Did you pick the correct number? Congratulations!
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