Thirteen countries have been banned from the Olympics in the past. Which are they, and why were they barred?
Al Jazeera analyses 20 years of climate data from more than 1,200 cities around the world. Here is what we found.
The FBI suspects a 20-year-old man to be behind the failed assassination attempt on the former US president.
Four US presidents and one candidate have been assassinated since the founding of the US.