100 Mind-Blowing Minus Facts That You Didn't Know

The largest known prime number has 24,862,048 digits. The new prime number is 2 multiplied by itself 82,589,933 times, minus 1.

Sound can be minus decibels. The quietest place on Earth is Microsoft’s anechoic chamber in Redmond, WA, USA, at -20.6 decibels. These anechoic chambers are built out of heavy concrete and brick and are mounted on springs to stop vibrations from getting in through the floor.

The current American flag was designed by a high school student. It started as a school project for Bob Heft’s junior-year history class in 1958, and it only earned a B-minus. His design had 50 stars, even though Alaska and Hawaii weren’t states yet; Heft figured the two would earn statehood soon and showed the government his design. After President Dwight D. Eisenhower called to say the design was approved, Heft’s teacher changed his grade to an A.

The Titanic film runs for as long as the ship sunk. Minus the present-day scenes and opening/ending credits, Titanic is 2 hours and 45 minutes long – which is also the time it took for the ship to sink in 1912. Additionally, the collision scene lasted 37 seconds, which is also how long the ship collided with the iceberg in real life.

The U.S. flag was designed by a 17-year-old for school. In junior high school, Bob Heft designed the U.S. flag. He made a 50-star flag for the class project. However, the U.S. only had 48 states at the time, so Heft got a B minus for his work. However, his prediction that two more states would be added ended up being true. Heft wrote 21 letters and called the White House 18 times. Eventually, President Eisenhower called to tell him his design would be used. The design for the current U.S. flag was made official on July 4, 1960.

Minus 40 degrees Celsius is the same as minus 40 degrees Fahrenheit.

Minus 40 degrees Celsius is the same as minus 40 degrees Fahrenheit. Indeed true, Celsius and Fahrenheit are two different temperature scales. The Fahrenheit and Celsius intersect at one point and they equal at -40 °C and -40 °F.