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You can't start messing with our constitutionally protected right. >> there are interpretations of what the forefathers had. you're not allowed to have an automatic weapon. >> i know why you want them. they make a lot of noise, shoot a lot of bullets, match cho guns, cool looking. i understand why you want one. no one can tell me why you need it. >> we don't have to need it. it's a constitutionally protected right. >> those kids had a right to li live. >> you have the right to self-defense. it's not only a second amendment right. you have a right to life, liberty, pursuit of happiness. >> all ...

Of your screen. interstate 5 stretches from the canadian border in the north to the mexican border in the south. this particular bridge about 60 miles north of seattle is what's called a steel truss bridge. in the 1950s when we were building up our interstate highway system steel truss bridges were a basically ubiquitous design. practical and unglam otherous, stur ki and dependable, cost competitive and highly versatile. they were everywhere. and one of the distinguishing features of bridges built like this is the specific way in which they distribute their weight. the principle upon which all...