The recent run-up in oil prices has many Americans worrying about the cost of everything from gas to food, and with good reason. Of all the energy sources we use, petroleum is the most popular.

Looking to be transparent, the US government agency brings data-driven energy usage charts, which include everything from crude oil production to wind generation to gasoline prices, to the web. Dara ...

The energy of a graph is the sum of the moduli of the eigenvalues of its adjacency matrix. We study the energy of integral circulant graphs, also called gcd graphs. Such a graph can be characterized ...

So, I’ve got good news and bad news. The good news: There is no substantial technical or economic barrier that would prevent the U.S. from reducing its greenhouse gas emissions 80 percent below 1990 ...