Is there more good news than bad? Newspapers present a world of war, violence, environmental destruction and division. But some say we have many reasons to be cheerful.
Behold: the clean battery of the future
Cotton candle: Just two grams of cotton are needed for each battery cell. Glossary
Pesticide - A substance used for destroying insects or other organisms.
Dengue - A debilitating viral disease transmitted by mosquitoes.
Colombia - A country in South America with a population of just over 50 million.
Relentlessly - Unceasingly.
Gaza - The smaller of two Palestinian territories, home to two million people. It is located on the Mediterranean coast, bordered by Israel and Egypt.
Myanmar - The largest country in mainland south-east Asia, formerly known as Burma. It is an ethnically diverse place, something that has often resulted in fierce conflict.
Teflon - Its scientific name is polytetrafluoroethylene.