Illusionist escapes cement box in Times Square 
NEW YORK, June 5 (Reuters Life!) - U.S. illusionist Criss Angel appeared to escape on Tuesday from a cement box suspended above Times Square in New York after it crashed to the ground without anyone seeing him emerge.
All of the references to “cement” should be changed to “concrete” in your article. Cement is a dry, finely ground powder that, when combined with water and aggregate (typically sand and rock), produces concrete, the material in which Criss Angel’s box was encased.
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Several readers wrote to point out the difference and of course technically they are correct.
However, as you can see from the photo, the illusionist’s own logo called it the Criss Angel Mindfreak Cement Block, so we went with the word he used. Also, a check with a thesaurus shows concrete listed as a synonym for cement, so this didn’t seem to be a radical departure: GBU Editor
REUTERS photo by Chip East

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“cement” is usually used to cement building blocks together, and for decorative or non-loadbearing applications - concrete is more solid and structural, being cement with grit, it is often used with metal reinforcments - pre-stressed concrete.
- Posted by Matthew Sleigh