The First In
In 1960, the Soviet space program opened a selection process where some 3500 volunteers were presented, all fighter pilots. The last twenty received initial training and then a group of six men was chosen. Finally Gagarin is elected as the first cosmonaut, and subjected to a series of experiments and tests to determine his physical and psychological resistance during flight.
Gagarin competed in this selection with German Titov and Grigori Nelyubov . He was chosen for his exceptional physical characteristics. Gagarin measured 1.57 m (5 ft. 2 in.) meters, an advantage in the small cabin of the Vostok ship. Titov was dressed in in the cosmonaut suit on the first flight into space as a reserve in case Yuri couldn’t fly, until the rocket took off. Three months later, Titov became the second Russian pilot to fly in space, and the third human, after American Alan Shepard.
What is a hovercraft?
An ACV or air cushion vehicle is a craft that uses blowers that create a high pressure under the vehicle, thus creating lift, and another engine with propeller that produces directional motion.
The first hovercraft design in the historical record that used the term hovering was in 1716, Sweden and made by Emanuel Swedenborg, and looks like an upside down boat.
Then in 1915-1916 Dagobert Müller von Thomamühl created a prototype vehicle, named Versuchsgleitboot (Test float boat) System. Dagobert Müller von Tomamyul was the son of the main constructor of the Austro-Hungarian Navy - Rear Admiral von Tomamyulya Wenzel Müller (1841-1910).
Technetium is a silvery-gray radioactive metal with atomic number 43 and symbol Tc. It is the lowest atomic number element without any stable isotopes and an important thing to know is that every form of it is radioactive. Technetium was the first element to be produced artificially and all its isotopes are radioactive.
At 5:29:45 a.m. local time, on the morning of July 16, the first atomic bomb was detonated in the New Mexico desert, 120 miles south of Santa Fe. The test was made by the United States Army back in 1945
The bomb was mounted atop a 30 meters steel tower built at Trinity, specifically for the test. Researchers believed that detonating the bomb at that height would reduce the amount of radioactive dust raised by the explosion. They were in a way simulating the air-drop method of deployment that was eventually used by the real bombs.
The Bagdad Battery
In 1936 near Bagdad, workers uncovered an ancient tomb while constructing a new railway for the city. Analyzing the relics, archeologists were able to identify the creators of the artifacts as the Parhian Empire (The Parthians ruled over the western half of Khorasan region in northeastern Iran.)
In 1938, Dr. Wilhelm Konig, a German archeologist, identified the clay jar as a possible battery. The jar was sealed with pitch at the top, an iron rod in the center, surrounded by a cylinder-shaped tube made from wrapped copper sheets. The height was approximately 14 cm, and the copper tube had somewhere around 4 cm in diameter and 12 cm in length. The jars have been named the "Baghdad Batteries".