Menstrual cycles are highly individual, making blanket advice found on social media difficult to apply, researchers say.
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Ukraine's fortress cities under fire as Russia bids to seize rest of Donbas
Kramatorsk and Slovyansk are now the main focus of Russian ground assaults, and residents are being told to leave.
Spies, strategies and missed opportunities: How the lessons of 9/11 are still being learnt
The attacks came to define a generation of foreign, security and intelligence policy in the first decades of this century, the BBC’s security correspondent writes.
UEFA Champions League
Highlights from the opening round of matches in the UEFA Champions League group stage.
Two goals in two games - Sesko gives Man Utd a different threat
Benjamin Sesko's return to Manchester United's starting line-up is well timed ahead of Sunday's Premier League encounter with Manchester City
Five killed and 67 injured in Russian strike on shopping centre, Ukraine says
The attack in Pavlohrad city centre was the third Russian strike on a mall within days, local media report.
Labour mayors in England vow to cap tourist tax at 5%
Reform UK and the Conservatives have criticised plans for the new levy on visitors' overnight stays.
England captain Jones calls for fertility support
England captain Meg Jones wants the Red Roses to have access to fertility support and egg freezing.
Man United put four past Sabah on Champions League return
Manchester United recorded their biggest Champions League victory since 2020 as they swept Sabah FK aside at Old Trafford.
Man jailed after threatening to kill son's teacher in French village
The father had threatened to behead a female primary school teacher near Toulouse.
Man jailed after threatening to kill son's teacher in French village
The father had threatened to behead a female primary school teacher near Toulouse.
Teacher sexually abused pupils at multiple schools
Bronwen James, 30, admitted abusing two girls and was convicted of offences against a teenage boy.
US airport security weighs major changes 25 years after 9/11
Americans will soon be able to see their loved ones off at airport gates as part of the changes.
More than 20 children killed in DR Congo school fire
Officials say there was a stampede as they fled a fire that engulfed two schools in the eastern rebel-held city of Bukavu.
2030 Winter Olympics boss departs amid turmoil
Edgar Grospiron leaves his position as president of the organising committee for the 2030 French Alps Winter Olympics just 18 months after his appointment.
Spurs and Richarlison in dispute over contract
Tottenham and their forward Richarlison are in dispute over the remaining nine months on his contract.
Four hurt and seven arrested in London stabbing
Seven people are arrested after a fight that an eyewitness says broke out near a KFC restaurant.
Four killed and 60 injured in Russian strike on shopping centre, Ukraine says
The attack in Pavlohrad city centre was the third Russian strike on a mall within days, local media report.
Watch: Is the Bayeux Tapestry exhibition worth the hype?
Crowds have been flocking to the British Museum to see the Bayeux Tapestry as it's on public display in the UK for the first time since it was created nearly 1,000 years ago.
Father of A66 teen charged with funeral assault
Police charged Gye Worthy with assault at the funeral for his son who was killed in the A66 crash.
Yemen's Houthis reportedly seize strategic Red Sea port of Mokha
Mokha's capture would bring the Iran-backed group closer to controlling the Bab al-Mandab Strait waterway, a key shipping route.