Comparison shopping engines collect product information, including pricing, from participating retailers and then display that collective information on a single results page in response to a shopper's search query. In this way, shoppers can compare each retailer's price, shipping options, and service on a single page and choose the merchant that o

Archaeology is an interdisciplinary science, and much of it ? from establishing the ages of artefacts to mapping a site before excavating it ? makes use of physics. The ages of things of interest to archaeologists ? including royal bones ? can be estimated from the proportion of carbon-14 they contains. The radioactive isotope of carbon exists natu