Former Russian double agent Sergei Skripal and his daughter, Yulia, are poisoned by the Novichok nerve agent in Salisbury, England

The world's last male northern white rhinoceros dies in Kenya, making the subspecies functionally extinct

In over 900 cities internationally, people participate in demonstrations against gun violence and mass shootings, calling for stronger gun control in the "March for Our Lives"

Kim Jong-un crosses into South Korea to meet with President Moon Jae-in, becoming the first North Korean leader to cross the Demilitarized Zone since its creation in 1953

The wedding of Prince Harry and Meghan Markle was held at St George's Chapel, England, with an estimated global audience of 1.9 billion

At least 109 people are killed and hundreds wounded by the eruption of Volcán de Fuego, Guatemala's deadliest volcanic eruption in over a century

Seventeen people die in Caracas, Venezuela following the El Paraíso stampede after a tear gas canister is detonated in a crowded club

Twelve boys and their football coach are successfully rescued from the flooded Tham Luang Nang Non cave in Thailand, following a 17-day ordeal that gained worldwide attention

Scientists report the presence of a subglacial lake on Mars, 1.5 km (0.93 mi) below the southern polar ice cap and extending sideways about 20 km (12 mi), the first known body of water on any planet apart from our own

15-year-old Swedish pupil Greta Thunberg starts to stay out of school in an attempt to give attention to the climate change issue

The Washington Post journalist Jamal Khashoggi is murdered inside the Saudi consulate in Istanbul, Turkey, triggering a diplomatic crisis for Saudi Arabia

Canada legalises the sale and use of cannabis, becoming the second country in the world to do so, after Uruguay in 2013