Here's what you need to know when comparing dental implants with four common types of dental bridges. What are dental implants? Dental implants are a solution for missing teeth that can last a ...

(A version of this activity originally appeared on NOVA's Super Bridge Web site.) How would you span a narrow waterway? A freeway? A wide river? An ocean bay? Learn about the four major types of ...

Arch bridges are one of the oldest types of bridges and have great natural strength. Instead of pushing straight down, the weight of an arch bridge is carried outward along the curve of the arch ...