Starting in 1996, Alexa Internet has been donating their crawl data to the Internet Archive. Flowing in every day, these data are added to the Wayback Machine after an embargo period.
How LASIK Works - Lots of people are trading in glasses and contacts for more permanent vision correction. Curious about vision correction surgery? Find out if you're a candidate for LASIK and see how the process works.
How CPR Works - Sudden cardiopulmonary arrest is the leading cause of death for all adults. Cardiopulmonary resuscitation (CPR), is an emergency technique that saves lives. Find out all about CPR.
How X-rays Work - X-ray machines seem to do the impossible: They see straight through clothing, flesh and even metal thanks to some very cool scientific principles at work. Find out how X-ray machines see straight to your bones.
