The gums are the pink coloured tissues which hold the teeth in place. The medical name for the gums is gingiva. Unless good oral hygiene is practiced the gums are at risk of a number of diseases such as gingivitis and periodontitis which can lead to dental problems.
2. Arm
Answer: Body Parts
The arm is the name of the upper limb which runs from the shoulder to the hand. The arm consists of 30 bones including the humerus, which makes up the upper arm, the ulna and radius which are in the forearm and the many small bones of the hand and fingers.
3. Rib
Answer: Body Parts
The ribs are the bones in the chest that come out from the breast bone and create a cage to protect the lungs and heart. Most people have 12 pairs of ribs but some people are born with extra ribs and some with too few as a result of genetic mutations.
4. Toe
Answer: Body Parts
The toes are the digits of the foot and each toe consists of three bones apart from the big toe which only has two. The bones in the toes are called phalanges.
5. Gun
Answer: Weapons
A gun is a weapon which fires a bullet, shell or other projectile using either an explosive force or pressure. The term gun is often used generically for many different types of weapon including hand held weapons or firearms and large weapons such as cannons.
6. Axe
Answer: Weapons
Humans have been using axes for millions years going back to the handle-less stone axes of the stone age period. Axes have been used as both tools and weapons throughout human history. Axes were used as weapons all over the world until the introduction of gunpowder based weapons made them obsolete.
7. Ram
Answer: Weapons
In the context of weapons a ram can either be an ancient siege weapon designed to break down walls or gates or a modern surface-to-air missile. A battering ram, was a type of siege weapon which consisted of a large beam which could be repeatedly swung or pushed against walls or gates to weaken and destroy them.
The RAM missile is a small surface-to-air missile used by many navies as a defensive weapon for ships.
8. Sai
Answer: Weapons
The sai is a type of sword originating in the area of Okinawa in Japan. The weapon consists of a long thin central prong with two shorter prongs located either side of the central one. The sai can be used as a stabbing or striking weapon and there are various techniques for using the weapon which enable it to be used in both lethal and non-lethal ways.
9. Gnu
Answer: Animals
The gnu is another name for the wildebeest, a type of antelope found in eastern and southern parts of Africa. There are two species of gnu: the white-tailed gnu (or black wildebeest) and the brindled gnu (or blue wildebeest).
10. Yak
Answer: Animals
The yak is a type of ox most commonly found in the Himalayas and Tibet. Yaks have a coat of thick dense fur which hangs down below their stomach helping them to survive in harsh conditions. Yaks are used for transporting goods and ploughing and provide milk, wool and meat - yak droppings are also dried and used as fuel in Tibet.
11. Koi
Answer: Animals
Koi is a name given to various coloured varieties of the fish carp which are generally kept purely for aesthetic reasons. Koi were originally bred in Japan in the early 19th century and the name koi is derived from the Japanese word for carp.
12. Olm
Answer: Animals
The olm is a type of salamander which inhabits caves in Europe. Although the olm is classed as an amphibian it spends the majority of its life in water and it eats, sleeps and breeds underwater. As it spends its life in dark caves the olm has very underdeveloped eyes rendering it blind although its senses of smell and hearing are more acute.
13. Eta
Answer: Greek Letters
Eta is the seventh letter of the Greek alphabet. In very early Greek the letter had the sound of the letter 'h' however this changed over time so that in Classical Greek the letter represented a long 'e' sound. In Modern Greek the eta is pronounced like the letter 'i'.
14. Rho
Answer: Greek Letters
Rho is the seventeenth letter of the Greek alphabet and represents an 'r' sound. The letter is used to represent many different concepts in maths and physics and when combined with the letter Chi is used as the Christian symbol known as a Chi Rho.
15. Tau
Answer: Greek Letters
Tau is the nineteenth letter of the Greek alphabet and corresponds to a form of the sound of the letter 't'. The letter has many uses in maths and science including as the term for the ratio of the circumference of a circle to its radius.
16. Phi
Answer: Greek Letters
Phi is the twenty-first letter of the Greek alphabet and is usually rendered in roman characters as an 'f'. Phi, in both its upper and lower case versions, has a large variety of uses in maths and science, including to represent the concept of the golden ratio.
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