The Natural Color of Rubber is White. Rubber is made black by adding various chemicals, such as carbon black. This isn’t just for cosmetic reasons, but because adding chemicals like carbon black to the rubber drastically increases desirable qualities of the rubber.
What days are there no professional sports played?
The only two days of the year in which there are no professional sports games–MLB, NBA, NHL, or NFL–are the day before and the day after the Major League All-Star Game.
What year was the first lighthouse built?
1716 – First lighthouse built in the United States was Boston Lighthouse built on Little Brewster Island. This lighthouse was destroyed during the Revolutionary War and was rebuilt in 1783 and still stands today.
Who were the original members of NATO?
At present, NATO has 28 members. In 1949, there were 12 founding members of the Alliance: Belgium, Canada, Denmark, France, Iceland, Italy, Luxembourg, the Netherlands, Norway, Portugal, the United Kingdom and the United States.
Where is the baobab tree found?
There are eight species. Six species live in Madagascar, one in mainland Africa, and one in Australia. The baobab is the national tree of Madagascar. Other common names include ‘boab’, ‘boaboa’, ‘bottle tree’, ‘the tree of life’, ‘upside-down tree’, and ‘monkey bread tree’.
Which hand do you use to salute?
When wearing headgear without a visor or uncovered and not wearing glasses, on the command of execution ARMS of Present, ARMS, execute the hand salute as previously described, except touch the tip of the right forefinger to the forehead near and slightly to the right of the right eyebrow.
What causes a rainbow to appear?
A rainbow is an optical and meteorological phenomenon that is caused by both reflection and refraction of light in water droplets resulting in a spectrum of light appearing in the sky. It takes the form of a multicoloured arc. Rainbows caused by sunlight always appear in the section of sky directly opposite the sun.
Where does the word robot come from?
The word robot was introduced in 1920 in a play by Karel Capek called R.U.R. , or Rossum’s Universal Robots. Robot comes from the Czech word robota, meaning forced labour or drudgery. In the play, human-like mechanical creatures produced in Rossum’s factory are docile slaves.