The e-book surge is one of the biggest indicators of the impact of technology on culture, and the nation's public librarians have been careful observers of the trend for years. (computerworld.com)
Many careful observers believe that human economic activity is already at an unsustainable level in many parts of the world and even globally, as indicated by global warming. (religion-online.org)
Babies are careful observers when in a «quiet alert» state. (candokiddo.com)