The little hole at the top of many pen caps is not a mistake. It can be an important safety feature….
Tires have tiny raised bars hidden inside their grooves called treadwear indicators. As the tire…
Tires have tiny raised bars hidden inside their grooves called treadwear indicators. As the tire…
That strange rounded bump under the front of many large ships is called a bulbous bow. It changes…
That strange rounded bump under the front of many large ships is called a bulbous bow. It changes…
The gaps and metal joints you cross on many bridges are intentional. Bridge materials expand when…
The gaps and metal joints you cross on many bridges are intentional. Bridge materials expand when…
Airport runway numbers tell pilots which direction the runway points. The number is normally based…
Airport runway numbers tell pilots which direction the runway points. The number is normally based…
Those upward-curving tips on many airplane wings are called winglets. They weaken swirling air…
Those upward-curving tips on many airplane wings are called winglets. They weaken swirling air…
Aitken’s chain saw was illustrated in a 1785 medical textbook. Unlike a modern chainsaw, it had no…
Aitken’s chain saw was illustrated in a 1785 medical textbook. Unlike a modern chainsaw, it had no…
Fitch’s barrels contain different amounts of sand, so a crashing vehicle meets increasing resistance…
Fitch’s barrels contain different amounts of sand, so a crashing vehicle meets increasing resistance…
UNESCO added the knowledge, skills and rituals behind the bridge’s renewal to its Intangible…
UNESCO added the knowledge, skills and rituals behind the bridge’s renewal to its Intangible…
The reusable patch weighs only about 7.2 grams and measures roughly 3 centimetres across. It can…
The reusable patch weighs only about 7.2 grams and measures roughly 3 centimetres across. It can…