"Friendships can deteriorate very quickly if you don't invest in them - it probably only takes about three months," says evolutionary psychologist Prof Robin Dunbar.
In picking veteran politician Mike Pence as his vice-president in 2016, Donald Trump went with a safe choice that would also help secure him the evangelical Christian vote.
A sugar-growing community in South Africa is reeling after the bodies of five women aged between 16 and 38 were discovered dumped on farms, writes the BBC's Kyla Herrmannsen.
Over recent weeks, tensions have been rising in the waters of the Eastern Mediterranean, prompted by what seems like a simple rivalry over energy resources.
Africa has been declared free from wild polio by the independent body, the Africa Regional Certification Commission.
Oral sex may create an environment for a common vaginal condition called bacterial vaginosis or BV, according to research in the journal PLoS Biology.
The Kremlin has dismissed accusations that President Vladimir Putin sanctioned the poisoning of critic Alexei Navalny.
Survivors and families of victims of a mosque shooting in New Zealand have spoken out against gunman Brenton Tarrant, in the third day of a four-day sentencing hearing.
The lawyers for the family of a black man shot in the back by police in the US state of Wisconsin say he will need a "miracle" to walk again.
EU trade commissioner Phil Hogan has apologised "fully and unreservedly" for attending a dinner in the west of Ireland with more than 80 people.
Kim Jong-un has warned North Korean authorities to prepare for the dangers posed to the country by the coronavirus pandemic and a looming typhoon.
The New York attorney general has asked a judge to order the testimony of Donald Trump's son in a probe of the president and his private businesses.
Turkey and Greece have announced they will conduct rival naval exercises off the Greek island of Crete on Tuesday amid rising tension over claims to gas and oil in the Eastern Mediterranean.
A Brazilian congresswoman has been accused of orchestrating the murder of her pastor husband, after multiple botched attempts.
A Florida taxi driver, who believed false claims that coronavirus was a hoax, has lost his wife to Covid-19.
A former headmaster has admitted subjecting a girl to a catalogue of sexual abuse in Aberdeen and Asia.