Evaluation of General Sources

These two sources show the controversy within the physics community about the possibility of perpetual motion machine which is a machine that can run forever with no loss of energy. In 2013 Frank Wilczek, Nobel Laureate in physics, came up with a proof that proves perpetual motion is possible. His theory was met with little response because within the physics community the conservation of energy is well accepted. After Wilczek submitted his paper, he had a critic by the name of Patrick Bruno. He disagreed with Wilczek's theorem because Wilczek's is looking at these crystals when they have an abundance of energy.

Ken Hammond "Mineral Quartz Crystal" 05/20/2005 via usda.gov Creative Commons CC0 1.0 Universal Public Domain Dedication

Source 1: ‘Time Crystals’ Could Upend Physicists’ Theory of Time

• URL- The URL ends with .com. Wired is a magazine that is owned by Conde Nast. This article was first publish in Quanta Magazine which is an independent division of the Simons Foundation.
• Author- Natalie Wolchover is the author of the article. Wolchover she is a staff writer at Quanta magazine. Her full bio is here.
• Last Updated- 04/30/2013
• Purpose- The text is there to inform the reader of something new that was once thought to be impossible but now might be possible.
• Graphics- There are some illustration and photos of an ion trap. These photos are there to enhance the readers understanding of the subject.
• Position on Subject- The article provided a look at both sides of this new theory. Most of the article was taking a look at Frank Wilczek's new theorem but the article did give consideration to Patrick Bruno's comment on the paper Wilczek published.
• Links- No links were provided to additional rescources about the topic only to where the article was originally published, which was here.

Source 2: Physicist proves impossibility of quantum time crystals

• URL- The URL ends with .org. Phys.org is owned by Omicron Technology Limited.
• Author- Lisa Zyga is the author of the article. Zyga is a writer for phys.org, pcmag and her blog on inventorspot.com.
• Last Updated- 08/13/2013
• Purpose- The purpose of the article was to inform the reader about a developing story in the phyiscs community.
• Graphics- This article did not have any graphics.
• Position on Subject- This article was focused on Bruno's paper that tries to disprove Wilczek's theorem.
• Links- This article provided links to Physical Review Letters where Frank Wilczek and critic Patrick Bruno posted their papers and comments regarding quantum time crystals. Also, links were provided to other articles to learn more.