Science And Technology Challenge 4

Explanation
France does not have a Ballistic Missile Defence System. This is because France relies on its nuclear deterrent as its primary means of defense against ballistic missile threats. France maintains a strong nuclear arsenal and has not invested in a dedicated ballistic missile defense system like other countries. Instead, France focuses on maintaining a robust and credible nuclear deterrent to deter potential adversaries.

Explanation
Lake Vostok is the largest subglacial lake in Antarctica. It is located beneath the East Antarctic Ice Sheet and is one of the largest lakes in the world by volume. The lake is covered by a thick layer of ice, estimated to be around 4 kilometers thick, and has been isolated from the outside world for millions of years. The discovery of Lake Vostok has sparked scientific interest as it provides a unique opportunity to study ancient ecosystems and potentially uncover new forms of life.

Explanation
Stephanie Kwolek invented Kevlar, the material used to make bulletproof vests. Kevlar is a strong and lightweight synthetic fiber that has high tensile strength and is resistant to heat and chemicals. Kwolek's invention of Kevlar in 1965 revolutionized the field of personal protection, as it provided a highly effective material for bulletproof vests and other protective gear. Her discovery has saved countless lives and has been widely used in law enforcement and military applications.

Explanation
The correct answer is Orissa. Wheeler Island, where India's missile testing facility is located, is a part of the state of Orissa.

Explanation
Brain cells, also known as neurons, are the longest living cells in the body. Unlike other cells that continuously divide and replace themselves, neurons are generally not replaced throughout a person's lifetime. This means that the neurons we are born with are the same neurons we have until we die. Although some neurons can be damaged or lost due to injury or disease, the majority of brain cells have the potential to last a lifetime.

Explanation
Sound travels 4 times faster in water than in air. This is because the speed of sound is determined by the medium through which it travels. In general, sound travels faster in denser mediums, such as water, compared to less dense mediums, such as air. The molecules in water are closer together and can transmit sound waves more efficiently, resulting in a higher speed of sound. Therefore, sound travels four times faster in water than in air.

Explanation
Oxygen is the most abundant element in the earth's crust. It makes up about 46% of the crust's mass. It is found in various minerals such as silicates, oxides, and carbonates. Oxygen is essential for the formation of rocks and minerals, and it also plays a crucial role in many chemical and biological processes on Earth.

Explanation
The Nobel Prize in medicine for the year 2011 was awarded to Bruce Beutler, Jules A. Hoffmann, and Ralph M. Steinman. Therefore, Dan Shechtman did not win the Nobel Prize in medicine for the year 2011.

Explanation
Riboflavin is a type of Vitamin B2. It is an essential nutrient that plays a crucial role in the body's energy production and metabolism. It is involved in the breakdown of carbohydrates, proteins, and fats, and helps convert them into usable energy. Riboflavin is also important for maintaining healthy skin, eyes, and nervous system. It can be found in various food sources such as dairy products, meat, eggs, and leafy green vegetables.

Explanation
The Red Data Book contains information about endangered plants and animals. It serves as a comprehensive record of species that are at risk of extinction. The book provides valuable data on the status and distribution of these species, helping to prioritize conservation efforts and raise awareness about the importance of protecting biodiversity. The inclusion of endangered forests or hazardous chemicals in the Red Data Book is not mentioned or implied in the question.