Aquaponics is a system for farming fish and plants together in a mutually beneficial cycle. Fish produce waste that is a fertilizer for plants while plants suck up the nutrients as they purify the water. The system is efficient and environmentally friendly.
The findings in public opinion polls are a fixture in the news media, with pollsters measuring the public's thoughts on politicians, public policy and pop culture. But how does polling work? And how accurate is it?
Duke Lemur Center preserves and protects lemurs, unique primates that are the ancient relatives of monkeys, apes and humans. Lemurs evolved in isolation on Madagascar, but are threatened as the island's human population grows.