Ramadan, the Islamic holy month of fasting, commemorates the first revelation of the Quran to Muhammad.

The fastest tennis serve ever recorded was by John Isner at 253 km/h (157.2 mph).

Olympic weightlifters follow a precise diet and weigh in the day before competition to make their weight category.

The concept of karma — actions determining future circumstances — appears in Hinduism, Buddhism, Jainism, and Sikhism.

The Sydney Opera House features a distinctive shell-like design.

The Tour de France has 21 stages over 23 days, covering around 3,500 km of some of Europe's most challenging terrain.

The didgeridoo, played by Aboriginal Australians, may be the world's oldest wind instrument — over 40,000 years old.

Shintoism, Japan's indigenous religion, venerates kami — spirits in nature, ancestors, and sacred objects.

About 50% of marriages end in divorce in many developed countries.