The dollar has slipped over the past six months, but still looks dear
Why some diseases are hard to eradicate
Suicides in Japan hit a 20-year low
Over 250m people used drugs at least once in 2015
A new type of drone, neither military nor civilian, is emerging
Interracial marriages are rising in America
Central banks' holdings of government bonds
Global external financial inflows into Africa fell last year
A surge in the value of crypto-currencies provokes alarm
The world is more stable than the news suggests