Imagine what you could do with a machine that could make things disappear. 

For inspiration, you could read some books. In the books of J.R.R. Tolkein, Bilbo Baggins finds a ring that can make him disappear. Of course, there's also poor Harry Potter, who used his invisibility cloak to hide from danger. 

Now that you've got some ideas, it's time for the hard part: building the cloak. To do that, you have to give up science fiction and turn to real science. An invisibility cloak has to cheat anything or anyone who might be watching. In order to understand how something can be seen, it's important to understand how we see. 

Human beings can only see objects that reflect light waves. These waves enter the eye and are then processed by the brain. However, if an object doesn't reflect light, then the waves don't enter the eye, and the brain doesn't process. So building an invisibility cloak is building something that doesn't reflect light. 

Cummer was part of a team of scientists from Duke University, including David Smith and David Schurig, who built the world's first version of an invisibility cloak. They had been inspired by the work of a British physicist, John Pendry. He in May said that an invisibility cloak was possible and Pendry was not the only one thinking about a disappearing act. At the same time, a Scottish physicist, UIf Leonhardt published a paper on building invisibility equipment. 

"It wasn't easy," says Cummer. "As often happens in science and research, it didn't work very well the first time. That first cloak didn't work like Harry Potter's --- the scientists didn't actually see anything disappear. So the research is still under way. " QUESTIONS:

Q1:
1. What are researchers trying to construct?
2. What are scientists attempting to make?
3. What are scientists making attempts to build?
Q2:
1. Who tried to build the first invisibility cloak?
2. Who was the first to attempt construction of an invisibility cloak?
3. Who was the first to try and make an invisiblity cloak?
Q3:
1. How many researchers were in the Duke team?
2. What was the size of the Duke research team?
3. How big was the group of Duke scientists?
Q4:
1. Did the article name the Duke scientists?
2. Did the article say who the Duke scientists were?
3. Were the Duke researchers named in the story?
Q5:
1. Who are two of the Duke scientists?
2. What are the names of two of the scientists from Duke?
3. What are two of Duke's scientists called?
Q6:
1. Whose work inspired the project of the Duke scientists?
2. Whose work did the scientists draw from?
3. Whose writing inspired the invisiblity cloak project?
Q7:
1. What novelist does the article mention?
2. Which writer appears in the article?
3. What writer of novels does the article talk about?
Q8:
1. Who is one of JRR Tolkien's characters?
2. What is the name of one of JRR Tolkien's characters?
3. Who is a character that JRR Tolkien came up with?
Q9:
1. What did Bilbo Baggins find?
2. What came into the possession of Bilbo Baggins?
3. What did Bilbo Baggins come across?
Q10:
1. Did Bilbo's ring do anything?
2. Did the ring that Bilbo found have any special abilities?
3. Was there anything that Bilbo's ring was able to do?
