Elephants have a keen nose. They have more smell receptors than any mammal – including dogs – and can sniff out food that is several miles away. A new study tests their ability to distinguish between similar smelling plants.
From the 20th century to the present, Russia has been the primary beneficiary of American espionage. Here's a look at the most memorable offenders, from Aldrich Ames of the CIA to Robert Hanssen of the FBI.