26. How is hair produced and how does it grow?
Hair is made of a tough protein called keratin. A hair follicle anchors each hair into the skin. The hair bulb forms the base of the hair follicle. In the hair bulb, living cells divide and grow to build the hair shaft
27. Which is the only bird that can fly backwards and forwards?
Hummingbirds are incredible flyers, with the ruby-throated hummingbird beating its wings 80 times every second, an ability that inspired this blog's name. These tiny birds can fly forwards, hover, and are the only known birds to fly backwards as well.
28. Why is beer in brown bottles?
Beer bottle is a bottle made to contain beer, usually made of glass and comes in various sizes, shapes and colours (usually brown or green). Dark amber or brown glass greatly reduces the presence of UV light, a contributing factor of beer spoilage. However, lighter-colored bottles are often used for marketing reasons.
29. How many miles is a nautical knot?
It is slightly more than a statute (land measured) mile (1 nautical mile = 1.1508 statute miles ). Nautical miles are used for charting and navigating. A knot is one nautical mile per hour (1 knot = 1.15 miles per hour ).
30. Why do you cry when you cut onions?
When you cut an onion, it releases a gas called, ready for this, Propanethiol S-oxide. When mixed with certain enzymes in the onion, it creates a sulfur gas. These gases then get to your eyes and create a mild acid which irritates the eyes.
31. How is food cooked in a microwave?
Cooking with Microwaves. Microwaves are produced inside the oven by an electron tube called a magnetron. The microwaves are reflected within the metal interior of the oven where they are absorbed by food. Microwaves cause water molecules in food to vibrate, producing heat that cooks the food.
32. Which is the only snake that builds a nest?
The female snake, about 13 feet long, builds a nest to lay its eggs. In fact, the King Cobra is the only snake in the world that builds a nest.
33. When was the hot air balloon invented?
On November 21, 1783 the first free flight carrying a human occurred in Paris, France. It was in a hot air balloon made of paper and silk made by the Montgolfier brothers. The balloon carried two men, Francois Pilatre de Rozier and Francois Laurent, Marquis of d' Arlanders.
34. Why does your hair turn white when you get older?
As we get older, the pigment cells in our hair follicles gradually die. When there are fewer pigment cells in a hair follicle, that strand of hair will no longer contain as much melanin and will become a more transparent color like gray, silver, or white as it grows.
35. Who wrote the first computer program?
Augusta Ada King, Countess of Lovelace (10 December 1815 – 27 November 1852), born Augusta Ada Byron and now commonly known as Ada Lovelace, was an English mathematician and writer chiefly known for her work on Charles Babbage's early mechanical general-purpose computer, the Analytical Engine.
36. Is it possible to fire a gun in space?
Fires can't burn in the oxygen-free vacuum of space, but guns can shoot. Modern ammunition contains its own oxidizer, a chemical that will trigger the explosion of gunpowder, and thus the firing of a bullet, wherever you are in the universe. No atmospheric oxygen required.
37. Which animal's eye is bigger than its brain?
Ostrich has the biggest eyes in the whole animal kingdom. Its eye is bigger than its brain. Ostriches don't hide their head in the sand. They will lay their head on the ground if they sense a danger.
38. What was the first country to allow females to vote?
New Zealand was the first country to allow women to vote (in 1893), while the King Abdullah of Saudi Arabia granted women the right to vote in 2011. The United States finally began allowing women to vote in 1920, after the ratification of the 19th Amendment to the Constitution.
39. How many moons does Saturn have?
The moons of Saturn are numerous and diverse ranging from tiny moonlets less than 1 kilometer across to the enormous Titan which is larger than the planet Mercury. Saturn has 62 moons with confirmed orbits, 53 of which have names and only 13 of which have diameters larger than 50 kilometers.
40. Which is the longest word in English?
Longest Words. (45) PNEUMONOULTRAMICROSCOPICSILICOVOLCANOCONIOSIS (also spelled PNEUMONOULTRAMICROSCOPICSILICOVOLCANOKONIOSIS) = a lung disease caused by breathing in particles of siliceous volcanic dust. This is the longest word in any English dictionary.
41. When was the first commercial jet flight?
Then, on May 2, 1952, the British Overseas Aircraft Corporation (BOAC) began the world's first commercial jet service with the 44-seat Comet 1A, flying paying passengers from London to Johannesburg. The Comet was capable of traveling 480 miles per hour, a record speed at the time.
42. Which country is in 2 different continents?
Portugal: Continental Portugal is in Europe, while the Azores archipelago (also associated with Europe) has two islands (Corvo and Flores) that are part of the American plate (which makes it a tricontinental country, see Africa and Europe section below).
43. How many different types of trees are there in the world?
There are about 750 types of trees in North America and about 100,000 in the world. Many of those are endangered. Those numbers count both conifer (cone bearing) trees and deciduous trees.
44. How many zeros are there in a VIGINTILLION?
a cardinal number represented in the U.S. by 1 followed by 63 zeros, and in Great Britain by 1 followed by 120 zeros.
45. Why is the keyboard keys not in alphabetical order?
The reason dates back to the time of manual typewriters. When first invented , they had keys arranged in an alphabetical order, but people typed so fast that the mechanical character arms got tangled up. So the keys were randomly positioned to actually slow down typing and prevent key jams.
46. Can clownfish change gender?
Clownfish, wrasses, moray eels, gobies and other fish species are known to change sex, including reproductive functions. A school of clownfish is always built into a hierarchy with a female fish at the top. When she dies, the most dominant male changes sex and takes her place.
47. How many islands are there in Japan?
Japan is a stratovolcanic archipelago of 6,852 islands. The four largest islands are Honshu, Hokkaido, Kyushu, and Shikoku, which together comprise about ninety-seven percent of Japan's land area.
48. Where is Coca Cola not sold?
There are now just two countries in the world where Coca-Cola cannot be bought or sold - at least, not officially. They are Cuba and North Korea, which are both under long-term US trade embargoes (Cuba since 1962 and North Korea since 1950).
49. What do you call the smell after it rains?
One of these odors, called "petrichor," lingers when rain falls after a prolonged dry spell. Petrichor the term was coined in 1964 by two Australian scientists studying the smells of wet weather is derived from a pair of chemical reactions.
50. What causes red hair?
About 1 to 2 percent of the human population has red hair. Redheads have genes to thank for their tresses. Research shows red hair usually results from a mutation in a gene called MC1R, which codes for the melanocortin-1 receptor. The pigment found in redhair that makes it red is called pheomelanin.
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