Humans tend to think in linear concepts, largely due to some general principles of observation; if one raindrop weighs 50 milligrams, two raindrops … 展开

Satellites stand out as a notable recent addition to the stars, but we seldom ever think about the concept of orbit. We know the general idea—an object circles around a planet or other large … 展开

You are currently being pressed on from above by 1,000 kilograms of air, the equivalent of the weight of a small car. This is because the Earth’s atmosphere is actually quite heavy, and humans stand at the bottom of an ocean of air carrying an atmospheric pressure of … 展开

Water is the most important liquid on Earth. It’s is also one of the most mysterious and counterintuitive compounds in nature. One of water’s lesser know properties, for example, is that hot water freezes faster than cold water. It is not fully … 展开