Since rockets go where there is no oxygen, they must take their own supply of oxygen with them in the form of a chemical. This chemical is called an oxidizer. ... For the future space missions, engineers hope to design a spacecraft with an engine that can use an airplane runway to take off and land horizontally. ...

• Word Count: 1684
• Approx Pages: 7
• Grade Level: High School

One is the trace contaminant control system and it detects trace odors, chemical leaks, and spills. ... These fluids will help engineers to build earthquake-resistant buildings, increase productivity in materials processing, and performance of power generating sources. ...

• Word Count: 1616
• Approx Pages: 6
• Grade Level: High School