The story surrounding the origin of Mickey Mouse is well-known. Walt, feeling defeated after losing the rights to produce films with the Oswald character that he created, was on a train ride home when he began thinking about a new star.
In Plane Crazy, he does not have white gloves or oversized shoes. He didn't even have a consistent number of fingers.
Mickey's shoes, his trademark footwear, is introduced in the second cartoon, The Gallopin' Gaucho (1928), and stayed ever since.
His gloves made their first appearance as part of his stage costume in The Opry House (1929). His gloves became a permanent fixture in When the Cat's Away (1929), and has remained part of his design ever since.
His eyes first occupied his entire face but were redesigned as small, black ovals giving Mickey a greater range of facial expression.
The Band Concert (1935) was the first standard Micky Mouse cartoon in color with a signature red shorts. By this time, Mickey's mischievous prankster actions had passed on to Donald Duck. Mickey had transitioned into the role of an endearing romantic and humble hero.
Over time Mickey's facial features softened and appeared younger while his personality continued to mature. The Brave Little Tailor (1938) was the peak of Mickey's career, and at this point, Mickey became more curious and wholesome.
Today Mickey Mouse is optimistic, brave, and lovable in his iconic red shorts, yellow shoes, and white gloves.
The wheel and the axle didn't suddenly spring up, but were a gradual, phased invention, starting with rollers that reduced friction on the ground, and helped the Egyptians and Mesopotamians move heavy objects.
The oldest discovered axle was found inside a potter’s wheel in a miniature, toy-like form in Mesopotamia. The fact that the center of the wheel is stationary as compared to the circumference is in fact the greatest mechanical insight ever known.
Combining the wheel with an axle was genius, leading to the invention of the wagon and other transport vehicles.
The thrust required for an object to overcome Earth’s gravity and atmospheric resistance and move towards space is called escape velocity. Besides Earth, the gravitational forces that can affect the object are those coming from the sun, moon and even other planets.
Apart from space vehicles and the military, rockets are used in life-saving rescue flares and fireworks, and even the ejector seats in military planes.
One of the earliest devices that used rocket propulsion was called the aeolipile, designed in the 1st century AD by Heron of Alexandria, and used steam to spin a metal ball.
Early prototypes of rockets were produced for firework displays in China in the 13th century, with the real, metal versions coming in the 19th century, used in Navy ships as an upgraded version of cannon.
Early rockets use flammable substances like gunpowder that propel it using the thrust of exhaust gases.