Washington (CNN) -- The U.S. Food and Drug Administration announced Wednesday that laboratory tests on popular smoking devices known as electronic cigarettes have found they contain carcinogens and other toxic chemicals dangerous to humans. E-cigarettes are battery-operated and contain cartridges filled with nicotine and other chemicals. Known as "e-cigarettes," the devices are battery-operated and contain cartridges filled with nicotine and other chemicals, spiced with flavors such as chocolate, cola or bubble gum. While manufacturers tout e-cigarettes as a "healthy way" to smoke, federal health officials say the devices turn nicotine, which is highly addictive, and other chemicals into a vapor that is inhaled by the user. "The FDA is concerned about the safety of these products and how they are marketed to the public," said Dr. Margaret A. Hamburg, commissioner of the FDA. CNN contacted Florida-based Smoking Everywhere, one of the largest manufacturers of e-cigarettes, after the FDA announcement, and a spokeswoman said the company had no comment. Because e-cigarettes have not been submitted to the FDA for evaluation or approval, the agency had no way of knowing the levels of nicotine or the amounts or kinds of other chemicals that the various brands of these products deliver to the user. That is why the FDA began to test them. The FDA's Division of Pharmaceutical Analysis analyzed the ingredients in a small sample of cartridges from two leading brands of e-cigarettes. In releasing its information, the FDA did not identify the two companies, but said in one sample, diethylene glycol -- a chemical used in antifreeze that is toxic to humans -- was detected. Other samples detected carcinogens that are dangerous to those who smoke them, the FDA said. The FDA has been examining and seizing shipments of non-U.S.-made e-cigarettes at the U.S. border since summer 2008. To date, 50 shipments have been stopped. The products examined thus far meet the definition of a combination drug-device product under the Federal Food, Drug, and Cosmetic Act. "We know very little about these devices, said Dr. Jonathan Samet, director of the Institute for Global Health at the University of Southern California, "but to say they are healthy -- that's highly doubtful."

Question: "What are two chemicals that have been detected by the FDA that are of a concern?"

OPTIONS:
- no
- yes

Answer: "Florida-based Smoking"

Response: no

MALS was formed here more than 30 years ago. Today, 14 staff attorneys, 26 office workers and 21 University of Memphis third- year law students work out of rented offices in the old Claridge Hotel building at 109 N. Main. Offices are spartan. There are no lush rugs or stylish furniture. The large table in the conference room is simple varnished wood. Offices are small and mostly plain, except for the eclectic mix of pop art, African statuary and neon that adorns litigation director Webb Brewer's space. Brewer, who has been at the agency 20 years, said there is a need for lawyers of all stripes to help with the problems of the poor. "The private bar could meet more of the need through pro bono work, but there are still cases that involve the systemic problems for low-income people that we would need to do," said Brewer. "The legal system marketplace just doesn't serve low-income people too well, except in fee-generat-ing type cases," Brewer said. "If a poor person gets run over by a bus, an attorney might take that case because they might be able to recover part of the damage award as attorney fees. But so many of the cases we handle have to do with basic rights and a decent life. There is just no profit motive." Larry Pivnick, law professor at the University of Memphis Law School and director of political programs at MALS, said Legal Services is a great learning laboratory for law students. "There are thousands and thousands of people who have problems that never get an opportunity to appear in court," Pivnick said. "Some people may not be particularly articulate. Courts have rules that clients don't always understand." Brewer said a major focus of the agency's work involves housing. "Although a lot of our work is grant-driven, we find that the lack of safe and decent affordable housing and the prevalence of predatory lending are the biggest problems in our client population," Brewer said, referring to clients such as James.

Question: "Who is Larry Pivnick?"

OPTIONS:
- no
- yes

Answer: "Brewer, who has been at the agency 20 years, said there is a need for lawyers of all stripes to help with the problems of the poor"

Response: no

Magnets are able to place a force on certain materials. This force is called a magnetic force. The force a magnet exerts is a little different from the forces you may normally think about. You exert a force on a book when you lift it. You also exert a force on the pedals of your bicycle. In both those cases, those forces cause a change. The change you see in both these cases is called motion. Magnets, too, can produce change. They can produce motion just like you do. Unlike you, magnets do not have to touch something to exert a force. A magnetic force is exerted over a distance. Thats right, a magnet can push or pull certain items without ever touching them. Thats how the maglev train works. Do you know another type of force that does not require objects to touch? These forces are known as non-contact forces. Another type of non-contact force you may be familiar with is gravity. Gravity too can cause changes in motion. Gravity holds our moon in orbit without touching it.

Question: "The force that holds our moon in place, is an example of what type of force?"

OPTIONS:
- no
- yes

Answer: "Gravity"

Response: yes

Once upon a time I had a dog named Toodles. He was black and white and had long floppy ears. He also had very short legs, but really big paws. Every Saturday we would go to the park and play Toodles' favorite game. Toodles loved playing fetch. One Saturday, Toodles ran over to the pond because he saw ducks swimming there. He ran all around the pond, barking at the ducks. The ducks ignored him, and kept swimming. Toodles wasn't having it! He jumped into the pond and started swimming toward the ducks, chasing around his new playmates. One of the ducks, braver than the others, poked Toodles with his beak - and then bit him right on one of his floppy ears! Toodles barked and ran out of the pond because the duck hurt his ear. Soaking wet, he ran toward where I was eating a sandwich on the grass and curled right up in my lap so I could make him feel better. After that, whenever he would see a duck, Toodles would run the other way.

Question: "How is toodles appearance discribed?"

OPTIONS:
- no
- yes

Answer: "Black and white with very floppy ears. He had short legs and big paws"

Response:
yes