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6. What makes hot peppers hot?

It is an irritant for mammals, including humans, and produces a sensation of burning in any tissue with which it comes into contact. Capsaicin and several related compounds are called capsaicinoids and are produced as secondary metabolites by chili peppers, probably as deterrents against certain mammals and fungi.
 
7. How many genes does a human being have?

Before the completion of the human genome project, many scientists were expecting to find 100,000 or more genes in our genome. This was based on the assumption that because we are one of the most complex creatures on Earth we should have lots of genes. However, it turned out we only have around 24,000 genes.
 
15. Why is Greece first in the Olympic parade?

Traditionally (starting at the 1928 Summer Olympics), Greece enters first, because of its historical status as the progenitor of the Olympics, while the host nation marches last. In the 2004 Summer Olympics in Athens, the Greek flag led the parade, while the Greek team marched in last, as the host nation.
 
16. What causes hail to form?

Hail is caused when raindrops are lifted up into the atmosphere during a thunderstorm and then supercooled by temperatures below freezing, turning them into ice balls, says Dr. Dick Orville of Texas A&M University. "The faster the updraft on these balls of ice, the bigger they can grow," he adds.
 
17. What colour is hippo milk ?

The color of Hippo's milk is bright pink. The reason why it is pink is that hippo secretes two kind of unique acids called “Hipposudoric acid” and “Norhipposudoric acid“. The two acids got their names from the word Hippopotamus.
 
19. When was the first website created?

The first website built was at CERN within the border of France, and was first put online on 6 August 1991: Info.cern.ch was the address of the world's first-ever web site and web server, running on a NeXT computer at CERN.
 
20. What was the first fast food restaurant?

Arguably, the first fast food restaurants originated in the United States with A&W in 1919 and White Castle in 1921. Today, American-founded fast food chains such as McDonald's and KFC are multinational corporations with outlets across the globe.
 
21. Which bird is the fastest swimmer?

In flight, the fastest bird is the spine-tailed swift of Siberia which can reach speeds in excess of 100 miles per hour, but the fastest bird in the water is the Gentoo penguin, which swims at about 22 mph. (Watch this video of a Gentoo swimming madly to avoid a pod of hungry orcas.)
 
22. How long would your DNA be if you stretch it out?

Each of us has 60 – 90 trillion cells so our DNA is very, very tiny when coiled up. If you could take it out of a cell and stretch it into a line, our DNA would be more than six feet long. That's almost two meters.
 
23. Which African country is not a member of the African Union?

Morocco is the only African country not to have joined the AU. It left the Organisation of African Unity in 1984, after the OAU granted membership to the Saharan Arab Democratic Republic set up by the independence movement in the disputed territory of Western Sahara.
 
24. What product had the first barcode stamped on it?

George J. Laurer is considered the inventor of U.P.C. or Uniform Product Code, which was invented in 1973. In June 1974, the first U.P.C. scanner was installed at a Marsh's supermarket in Troy, Ohio. The first product to have a barcode included was a packet of Wrigley's Gum.
 
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