How do they design rollercoasters? You're barreling down the track at 60 miles per hour, taking hairpin turns and completing death-defying loops. Your heart is in your throat and your stomach is somewhere near your shoes.The designers of the roller coaster carefully crafted this thrilling ride to be just that, terrifying!

RollerCoasters: Mathematics in Motion

http://www.discovery.com/exp/rollercoasters/update.htm

How long would it take to get to a star? Since travel to even the nearest star would take quite a while. Let's see, that's 4 light years -- call it 24 trillion miles. It's mostly interstate highway, so we can count on 65 miles per hour. Think we should pack a lunch?

http://whyfiles. news.wisc.edu/017planet/seti.html

http://www.nasa.gov/NASA_homepage.html/