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I Learned This Today
  • List of articles
  • Random article
  • About me
  • Contact
  • The Book Series
  • Categories

#1636 Why don’t we notice when we blink?

March 27, 2026 / Leave a Comment

Why don’t we notice when we blink? We don’t notice when we blink because our brain suppresses its visual center and makes sure our eyes are pointing in the same direction. Everybody is different, and we all blink a different number of times depending on the time of day, the condition of our eyes, the […]

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#1635 How does muscle memory work?

March 26, 2026 / Leave a Comment

How does muscle memory work? Muscle memory works because the brain makes more efficient connections between neurons. We call it muscle memory because it feels like our muscles are working on their own, but the memory is down to the brain and the nervous system. The more you repeat an action, such as learning to

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#1634 How could you build a base on the moon?

March 25, 2026 / Leave a Comment

How could you build a base on the moon? There are several problems involved with building a moonbase, but the biggest one is how to get all of the materials up there. NASA has just announced that they are going to spend $20 billion to put a base on the moon within the next seven

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#1633 When did people stop using canals?

March 24, 2026 / Leave a Comment

When did people stop using canals? Canals began to die out in the early 1900s as they were replaced by faster railways and more powerful trucks. The building of canals in many countries peaked in the mid 19th century. Britain had a denser network of canals than any other country, and at the peak, there

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#1632 How do we make blood?

March 23, 2026 / Leave a Comment

How do we make blood? Blood is made in our red bone marrow in a process called hematopoiesis. People have different quantities of blood depending on their size, but it is usually about 8% of a person’s body weight. 55% of the blood is made up of plasma, and the other 45% is a combination

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#1631 How does a jet engine work?

March 22, 2026 / Leave a Comment

How does a jet engine work? A jet engine works by mixing fuel with compressed air and then burning it. The gas expands, shooting out of the back of the engine, which pushes the plane forwards. At first glance, it would be difficult to understand how a jet engine moves a plane along. We naturally

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#1630 Why did people start using wallpaper?

March 21, 2026 / Leave a Comment

Why did people start using wallpaper? People first started using wallpaper to insulate their houses, but only the rich could afford it. Later on, wallpaper became cheaper and people used it because they couldn’t afford tapestries to cover their walls. Wallpaper, along with paper itself, was invented in China. The earliest known wallpaper was used

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#1629 Do we still need weather balloons?

March 20, 2026 / Leave a Comment

Do we still need weather balloons? Yes, weather balloons are still needed. Satellites can provide a lot of data, but they still cannot sample the atmosphere directly from inside it, and they are far more expensive. There are thousands of satellites in orbit around Earth at the moment, so it is easy to assume there

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#1628 Why do cats’ eyes glow in the dark?

March 19, 2026 / Leave a Comment

Why do cats’ eyes glow in the dark? A cat’s eyes glow in the dark because they have a special reflective layer in their eyes called a tapetum lucidum. Cats aren’t the only animals whose eyes glow at night. The reason for this comes down to the way that we see and why we can’t

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#1627 Who was Lloyd in Lloyd’s of London?

March 18, 2026 / Leave a Comment

Who was Lloyd in Lloyd’s of London? His name was Edward Lloyd, and he ran a coffee house in London in the late 17th and early 18th centuries. Lloyd’s of London is very famous, and the name often comes up with major disasters. However, Lloyd’s of London is not an insurance company. Rather, it is

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I learned this today

I am addicted to finding stuff out. I believe I can find the answer to any question I have.  So, I do. Every day. And the journey has enriched my life. From “when was sliced bread invented?” to “what is the Fermi Paradox?” If you are like me and believe we should try to answer all of our own questions, then come along.  Come and find out with me. You won’t regret it.

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