1. Unit 2 Science and Detection SAHAR ALMUDAIHEEM S.M 1

2. 2 Recent developments in technology have helped experts to solve mysteries. Recent developments in technology have helped experts to solve mysteries. X-rays and CT scans can help to locate missing objects. CT scans can be used for example to search for minerals underground. X-rays and CT scans can help to locate missing objects. CT scans can be used for example to search for minerals underground. Radiocarbon dating can identify the age of material. Radiocarbon dating can identify the age of material. DNA can identify animals or people. It can also be used to trace the development of human evolution. DNA can identify animals or people. It can also be used to trace the development of human evolution. Fingerprints can also help in solving crimes. Fingerprints can be used to provide secure access to computers or buildings. Fingerprints can also help in solving crimes. Fingerprints can be used to provide secure access to computers or buildings.

3. S.M 3 CT scan: computer tomography scan, i.e, X-rays that are processed by computer to create 3D image. CT scan: computer tomography scan, i.e, X-rays that are processed by computer to create 3D image. MRI (magnetic resonance imaging) scan, which uses magnets and radio waves. MRI (magnetic resonance imaging) scan, which uses magnets and radio waves. CT scans are better at imaging bones, while MRI is better for soft structures such as the brain. CT scans are better at imaging bones, while MRI is better for soft structures such as the brain. DNA: deoxyribonucleic acid, a molecule containing the unique genetic code for a living organism. DNA: deoxyribonucleic acid, a molecule containing the unique genetic code for a living organism.

4. S.M 4 CT scanners take 3D images of people or objects. They can be used for medical purposes or to solve mysteries. CT scanners take 3D images of people or objects. They can be used for medical purposes or to solve mysteries. Fingerprints were used in the second millennium BC to sign contracts and were first used to solve a crime in 1892. Fingerprints were used in the second millennium BC to sign contracts and were first used to solve a crime in 1892. DNA is useful for identifying people because everyone’s DNA is unique. DNA is contained in every molecule of the body. DNA is useful for identifying people because everyone’s DNA is unique. DNA is contained in every molecule of the body.

5. S.M 5 Overview of the Reading The passage describes some ways in which technology has been used to solve past mysteries. The technologies mentioned are DNA analysis and CT imaging. The mysteries relate to a robbery in Australia in 2009, a murder in Arizona in 1992, and a frozen mummy found in the Italian Alps in 1991. The passage describes some ways in which technology has been used to solve past mysteries. The technologies mentioned are DNA analysis and CT imaging. The mysteries relate to a robbery in Australia in 2009, a murder in Arizona in 1992, and a frozen mummy found in the Italian Alps in 1991.

6. S.M 6 Comprehension Questions 1. What do these three stories have in common? 2. What is different about the last story? This crime happened a very long time ago, and the body was preserved in the ice. All three situations used technology to solve a past crime. 3. In the first story, why were the detectives not able to solve the crime at that time? They were unable to solve the crime because the men escaped.

7. S.M 7 4. In the second story, what evidence did the police have and why was it sufficient? They found palo verde seed pods in the truck but couldn’t prove they were from the tree at the scene of the crime. 5. In the third story, what did the wounds on the Iceman’s body tell the scientists? That he had been in a fight some time previously, and that he was killed by an arrow. 6. What is the significance of the Iceman’s meal? It means that he didn’t die of starvation, that he knew how to find food in the mountains, and that he had been settled in a place for at least a few hours before being killed.

8. S.M 8 The video presents some information about attempts to identify the remains of Christopher Columbus and the controversy over where his remains are buried. The video presents some information about attempts to identify the remains of Christopher Columbus and the controversy over where his remains are buried.

9. S.M 9 1. How many ships did Columbus sail across the ocean with? When? Three: the Pinta, Nina, and Santa Maria. In 1492. 2. Why was the voyage important? It was important because before this voyage, Europeans did not know about the Americas. 3. Which countries are today located on the island of Hispaniola? Haiti and the Dominican Republic. 4. What is difficult to work with 500-year-old bones? They have deteriorated.