Unrelated Facts

 1. How Much Oxygen Required for A Space Mission?

Normal people can survive a week without food. One can survive more than a day without water. Without oxygen, it is difficult to survive for more than 2 min. Some exceptions occur. Aleix Segura, who holds the world record for holding the breath for 24 min and 3 secs. It's higher than the average run time of the Young Sheldon Series (18–21 min).

So how much oxygen we need?

An average adult can consume around 6 to 8 liters per minute. So, a person consumes more than 11000-litre air per day. We know that the air consists of around 21% of the air. Exhaled air consists of around 15%. From adding and subtracting we get 0.84-kg oxygen per year.

Based on the number of persons entering space, we can calculate the required amount of oxygen. Assume that four persons are traveling to the 30-day space mission. Each one of them consumes 0.84-kg oxygen. Four persons consume 4 x 0.84 kg = 3.36 kg roundoff value is 4 kg per day. We can say that the total amount of oxygen required for this mission is 120 kg.

Always keeping a little bit more is a good sign. The total amount of oxygen depends on the number of persons and the total period of the mission.

2. Who Invented The Scissors?

Hospital, School, Home and all kinds of Offices, Scissors are an appropriate thing. Tailors, Artists and school students can't cross their life without this scissor. Based on their purposes and age, scissors size and sharpness vary. We should know about the history of this important invention.

A famous writer Jane Claude Markyurine wrote about the use of scissors in the 14th century. Egyptians used bronze scissors before the birth of Christ. Scissors used to create clothes for ancient mummies.

Also, these pyramid producers used to groom both men and women of their desert. We can believe that those people created Barbershops before the third century. After those people all around the world imported and recreated these scissors. However, the Egyptian bronze scissors made its unique place on the blue planet.

In 1948, J.Wiss and sons published the book "The Story of Shears and Scissors" and wrote about the History of scissors. This book is about 'Sir Flinteres Petry.' Who redesigned the scissors and made that user friendly in the first century. In the 5th Century, Barbers and Tailors changed the design of Scissors based on their usage.

New age scissors (the one we use now) created by Lucy Austin in. This Washington inventor patented her creation in 1893. Like all animals, these scissors also evolved in history and get a better place in your pen stand and more. Many inventions come and go. They are suppressed by the new inventions, but few of them will survive like this Scissor.

3. Why Athletes Jumps Backward In High Jump?

When you see the high jump games on TV or the playground, that awesome. People jumping the bars where the height of the bar increases. In 1993 Olympic Cuba athlete Javier Sotomayor jumped the height of 2.5m. That is the world record in the history of men's high jump. In women division Bulgarian athlete Stefka, she holds a record for reaching the height of 2.09 m in 1987.

One thing is weird in this long jump event are athletes always jumping in backwards, why? Here the center of mass comes to answer this question. Our body's center of mass is placed inside or outside our body based on the movement. When we are standing in the ground our center of mass is somewhere in our belly. Center of mass placed near our chest while we are sitting.

When an athlete is trying to jump the bar he first-run from a certain point. He should convert his horizontal velocity into vertical velocity. Where the center of mass moves all the time based on the movement of our body. The athlete jumps backwards. He points, the center of mass of his whole body to the bar and makes the arc change in the center of mass and drops him.

When the athlete is trying to jump the front side, they should spend more force to lift his body and center of mass.