Houston, Texas is the fourth largest city in the country. The city has more than two million people in the limits of the city. The Houston Museum District is a very popular attraction; Houston has a booming and large, seventeen block theater district. Houston is vulnerable to hurricanes, and is also a frequent destination for people who need to evacuate from hurricanes in other nearby states. The city has an extremely humid and hot climate in the summer, with at an average of 99 days per year over 90 degrees. This extreme heat index has caused some to give the city the title of "the most air conditioned city on earth." High ozone levels are also a problem. Many oil companies are based in or have some presence in Houston, such as Exxon-Mobil, Shell Oil, Chevron and Citgo. The Texas Medical Center is one of the largest and most well respected medical centers in the world; and NASA also has its headquarters in this city. In summary, Houston is a large sized city with just about every resource a person could want located within its borders. You can find more information about Houston by looking at the yellow pages online, or by looking at a Texas business directory. You can also check out BestHouston.net for the best businesses in Houston, TX.