Jahangir Khan holds the record for the longest unbeaten streak in professional sports, winning 555 consecutive squash matches from 1981 to 1986. He won six world championships and 10 British Open titles, starting the streak at 18 years old. Other notable sports records include Vince Carter’s 22-season NBA career, John Isner’s 11-hour tennis match, and […]
Diamonds are the hardest natural substance on Earth, measuring a 10 on the Mohs scale. Diamond cutters use techniques such as splitting and polishing with a scaif or diamond saw to create sparkling gems, with up to 60% of the stone’s weight being lost in the process. The oldest technique is splitting, while the scaif […]
Alloy steel, with added carbon and other elements, is the hardest known metal with a tensile strength of 0.84 GPa and yield strength of 0.64 GPa. Carbon steel is surpassed only by non-very hard metals like rubies and diamonds. Carbon steel is commonly used in construction tools but is prone to corrosion. Tungsten carbide, iridium, […]
Astatine is the rarest natural element on Earth, with only about 25 grams occurring naturally at any given time. It has a half-life of 8.1 hours and is formed during the decay of uranium and thorium. Some scientists believe it could be a good cancer fighter, but its scarcity makes research difficult. Astatine is the […]
There are many languages in the world, and the difficulty of learning them depends on factors such as the learner’s native language and individual aptitude. Basque and Hungarian are considered the most difficult, while Chinese and Korean are easier for Western speakers. English is also difficult due to pronunciation and irregular verbs. There are over […]
