An Internet research gives potential participants a full description of the study, an informed-consent form, an opportunity to withdraw from the study, and information on how to obtain follow-up information. This Internet research:

What greek scientist created a screw to move water for irrigation?

Which two words in this excerpt from the count of monte cristo can be used as synonyms to determine the meaning of the word grotto? dantès entered the second grotto. the second grotto was lower and more gloomy than the first; the air that could only enter by the newly formed opening had the mephitic smell dantès was surprised not to find in the outer cavern. he waited in order to allow pure air to displace the foul atmosphere, and then went on.

What are policymakers trying to do by using the media to deliver specific messages to citizens?