What is Control Experiment

The experiments or groups, in which all the factors affecting an experiment except the one being tested are duplicated, are called control experiments or control groups

In addition to all the advantages that the Google Play Books service boasts, there is one significant drawback – the cost of books. Prices for e-books differ little from paper counterparts. This can be explained and justified by the convenience and the ability to read anywhere and at any time, but still I would like to pay less for the electronic version. Screens of e-ink e-books (“electronic paper”, “electronic ink”) – their properties, advantages and disadvantages You can read books in electronic form both on specialized devices – readers (commonly referred to as “readers” by the people), and on “universal” devices – tablets and smartphones.