October 20, 1973: Sydney Opera House opens. On this day in 1973, the Sydney Opera House, with its seashell-like roofs, opened. It was designed by Danish architect Jørn Utzon and took 14 years to build. Its roofs are covered with more than a million white tiles.
1891 🔬 Physicist James Chadwick was born in England. He discovered the neutron, one of the tiny particles inside the centre of every atom, and won a Nobel Prize.
1923 🎨 Children's author Otfried Preußler was born in what is now the Czech Republic. He wrote The Little Witch and The Robber Hotzenplotz, read by children in many languages.
2018 🚀 BepiColombo, a joint mission of Europe and Japan, launched toward Mercury, the smallest planet and the one closest to the Sun.
🧠 Question of the day
What covers the roofs of the Sydney Opera House?
Gold leaf
Grass and soil
White tiles
Show the answer
Answer: White tiles
🐾 World day: International Sloth Day
Sloths move so slowly that algae grows in their fur. The AIUNAU Foundation in Colombia started this day in 2010.