Crown Prince Naruhito became the Emperor of Japan following his father's abdication.
Indonesia announced plans to move its capital city from Jakarta due to the city sinking.
Climate change activist Greta Thunberg gave a speech in London, leading to protests across the city for four days.
Using gene therapy, eight babies suffering from ''bubble boy disease" were cured in Memphis, Tennessee.
The Notre Dame Cathedral in Paris caught fire, which destroyed the roof.
The world's largest plane, The Stratolaunch, had its first flight from the Mojave Desert in California.
Julian Assange, the founder of WikiLeaks, was removed from London's Ecuadorian Embassy by police.
Dutch ecologists reported that wolves were living in the Netherlands again for the first time in 140 years.
Researchers discovered that as many as 600 million birds die in the US every year after flying into skyscrapers.
The European Union Parliament declared single-use plastics were to be banned by 2021.
A Dutch art investigator recovered Pablo Picasso's stolen 'Buste de Femme' painting. It had been missing for 20 years.
The first kidney transplant between two persons with HIV occurred in Boston, Massachusetts, US.
Game of Thrones star Emilia Clarke shared her experience of fighting for her life after suffering two brain aneurysms during filming.
A woman in Bangladesh gave birth to twins one month after giving birth previously.
Disney purchased 21st Century Fox for $71 billion.
Queen Elizabeth II published her first post on Instagram.
The world's smallest baby was finally released from the hospital months after being born.
US Democrat Senator Bernie Sanders announced his second attempt to run for President.
Mexican drug lord Joaquín aka 'El Chapo,' was finally brought to justice.
Alcohol poisoning killed 144 people in the states of Uttarakhand and Uttar Pradesh, India.
Forty mummies were discovered and unearthed in Tuna el-Gebel, South Cairo, Egypt.
China's Chang'e-4 became the first spacecraft to successfully land on the far side of the Moon.
Same-sex marriage became legal in Austria.
A powerful tsunami hit Indonesia.
The 2018 partial shutdown of the US federal government began.
A powerful meteor exploded over the Bering Sea.
Nevada became the first US state with a female-majority legislature, with new appointments taking it to 51%.
In the Global Carbon Project, it was reported that CO2 emissions reached an all-time high (up 2.7%) driven by coal use in China and the consumption of oil.
The Japanese broadcaster NHK launched the world's first super-high definition 8K television channel.
A party boat on Lake Victoria in Uganda capsized and killed 29 people.
After 20 years of work, the Leaning Tower of Pisa had its lean corrected by 17.7 inches (45 cm).
A 15-week abortion ban in Mississippi was declared unconstitutional.
An American 26-year-old, John Allen Chau, was killed by natives living on the forbidden Sentinel Island in the Bay of Bengal.
A 19-mile crater was found under the Greenland Glacier.
The Camp Fire in California became that state's deadliest blaze after it killed 88 people and caused 52,000 people to be evacuated.
Two hundred bodies were found in a mass grave site between Ethiopia and Somalia.
29-year-old Alexandria Ocasio-Cortez became the youngest woman to be voted into the US Congress.
The UN published a report revealing more than 200 mass graves found in ISIS-controlled regions of Iraq.
A tiger, who hunted and killed 13 people, was killed after a large-scale hunt in Central India.
The Statue of Unity in India was officially completed making it the world's tallest statue at 597 ft (182 m).
Nigel Richards won the World Scrabble Championships for the fourth time in a row with the word 'groutier.'
Istanbul Airport was opened by President Recep Tayyip Erdogan.
Singer Sinéad O'Connor was converted to Islam.
Cesar Sayoc was arrested for sending 14 pipe bombs to prominent US Democrats.
The EU declared that single-use plastics would be banned by 2021.
Someone in South Carolina won a $1.6 billion lottery jackpot, making it the biggest win in US history at the time.
The biographic drama movie 'Bohemian Rhapsody,' about Freddie Mercury, premiered at Wembley Arena in London, UK.
The world's longest over sea bridge opened in China.
115,000-year-old human bones found in Poland turned out to be from a Neanderthal child who was eaten by a giant bird.
The Russian Soyuz MS-10 manned spacecraft malfunctioned during takeoff and made an emergency landing in Kazakhstan.
