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Category: Q & A

How does 3D printing work?

Answered by Wenchao Zhou. 3D printing, also known as additive manufacturing, is a process of joining materials to make objects from models, usually layer upon layer. The core idea of joining materials together to make objects is ancient. Some examples include various adhesives, bricks and mortar for building houses and even Lego blocks. 3D printing digitizes this idea by using a computer to control the joining of materials based on the digital model. The first 3D-printing technology, called stereolithography, was invented by Charles Hull in 1984. Hull worked for 3D Systems. His technology used a computer to control the...

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What is a Carbon Footprint?

Walking or riding a bicycle helps reduce the carbon footprint. Answered by Marty Matlock. The conversation about human impacts on climate change often leads to discussions of our carbon footprint. All human activities generate carbon emissions; the more prosperous we become, the more greenhouse gasses we tend to emit. The amount of greenhouse gasses we emit on an annual basis is often referred to as our carbon footprint. We can make decisions at the personal, family and community level that reduce our carbon footprint. In general, the largest contributor to our carbon footprint is energy used, especially electricity in...

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How Much Water Do We Need to Drink Daily?

Answered by Stavros Kavouras, professor and director of the U of A’s Hydration Science Lab and adjunct professor in medicine at the University of Arkansas for Medical Sciences. The daily total water intake guidelines for American adults is 3.7 liters for males and 2.7 liters for females. However, this amount includes the water from solid foods (fruits, vegetables, rice, etc.) that accounts for approximately 20 percent of total water intake. Thus, the total daily fluid intake is around 3 liters (96 oz) for males and 2 liters (64 oz) for females. This amount includes water from all beverages. However,...

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