Learn about the physics of resistance in a wire. Change its resistivity, length, and area to see how they affect the wire's resistance. Predict how changing each variable will affect the resistance.
I just purchased crackle subway tile (3x6) for our backsplash. As I was shopping around it seemed that $12-15 per square foot was the average price. You can get cheaper but they were VERY basic. I ended up with a Sonoma tile which was hand molded and cost $20 square foot.
Hiring a professional to install your glass backsplash might come with more up-front costs, but keep in mind that contractors will likely be able to get you a better wholesale price on materials (a plate of glass that is 18 inches wide, 4 feet in length, and 1/4 inch thick will cost roughly $300 to consumers).