Science, History & Trivia
Why Is the Sky Blue? The Science Explained Simply
The sky is blue because of Rayleigh scattering — here's the simple, accurate explanation of how sunlight creates a blue sky.
Science, History & Trivia
9 articles in this category
Science, History & Trivia
How Deep Is the Ocean? Facts About Ocean Depth
Learn the average depth of the ocean, the location of the deepest point (Challenger Deep), and fascinating facts about what lives in the dee...
Science, History & Trivia
How Hot Is the Sun? Temperature at Every Layer
Learn the surface temperature of the sun, its core temperature, and the mystery of why the corona is millions of degrees hotter than the sur...
Science, History & Trivia
How Many Countries Are There in the World?
There are 195 countries in the world by the most common count. Learn why the number varies and which territories have disputed status.
Science, History & Trivia
How Many Weeks Are in a Year?
A standard year has 52 weeks and 1 day. A leap year has 52 weeks and 2 days. Here's the full breakdown including ISO week years.
Science, History & Trivia
How Many Seconds Are in a Day?
There are 86,400 seconds in a standard 24-hour day. Here's the math and some fascinating context about leap seconds.
Science, History & Trivia
When Did World War 2 Start and End?
World War 2 started on September 1, 1939 and ended on September 2, 1945. Learn the key dates, causes, and outcome of the deadliest conflict...
Science, History & Trivia
When Did the Titanic Sink? Facts About the Disaster
The Titanic sank on April 15, 1912. Learn what happened, how many died, and key facts about the ship and its discovery.
Science, History & Trivia
How Long Do Cats Live? Average Lifespan and Factors
Indoor cats live 12–18 years on average; outdoor cats 5–7 years. Learn what affects cat lifespan and how to help your cat live longer.