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In 1966, computer scientist Joseph Weizenbaum created ELIZA at MIT to demonstrate how easily people could be deceived by computers. Using simple rules to rephrase user statements into questions like a Rogerian therapist, ELIZA convinced many users—including Weizenbaum's secretary—that it possessed real empathy, giving birth to the phenomenon known as the ELIZA effect.
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In quantum physics, a vacuum is never truly empty; it is filled with fleeting electromagnetic waves. If you place two uncharged metal plates incredibly close together in a vacuum, fewer waves can exist between them than outside. This difference in quantum pressure pushes the plates together, a phenomenon known as the Casimir effect.
Supernovas are usually the ultimate end for stars, but some survive. LP 40-365 is a low-mass white dwarf star traveling at extreme speeds out of our galaxy. Astronomers discovered that this 'zombie star' experienced a partial thermonuclear supernova. Instead of being completely obliterated, it survived the blast, which kicked it like a rocket across the cosmos.
In 1346, the Mongol-led Golden Horde laid siege to the Genoese trading port of Caffa on the Crimean Peninsula. When plague struck the attacking army, their commander ordered diseased corpses catapulted over Caffa's fortified walls. Terrified Genoese defenders retreated onto merchant ships bound for Italy, inadvertently ferrying the Black Death across the Mediterranean. Within five years, the pandemic wiped out an estimated one-third to one-half of Europe's entire population.
A persistent myth asserts that the Great Wall of China is the only man-made structure visible from space with the naked eye. In reality, astronauts in low Earth orbit cannot distinguish the Great Wall without cameras or binoculars. Because the wall is constructed from local stone and soil, its colors blend into the surrounding terrain, and its average width of just a few meters is far below the resolving power of human vision from orbit.
Almost every novice programmer begins by writing code that outputs "Hello, World!" to the screen. This famous introductory convention was popularized by computer scientist Brian Kernighan. He first used the string in an internal 1974 Bell Labs memorandum about the B programming language. It gained global fame when he included it in the classic 1978 textbook The C Programming Language, cementing its place in software history.
The popular belief that eating carrots gives you excellent night vision was actually a highly successful piece of military propaganda. During World War II, the British Royal Air Force developed a new, secret airborne radar technology to intercept German bombers at night. To keep this technological breakthrough under wraps, the government launched a public campaign claiming their pilots' deadly accuracy was due to eating lots of carrots.
Although Neptune is much farther from the Sun, Uranus holds the solar system's record for the lowest planetary atmosphere temperature ever measured. Deep in its cloud decks, temperatures plunge to minus 224 degrees Celsius. Unlike other giant planets, Uranus releases very little internal heat, leaving its upper atmosphere exceptionally frigid.
It is not just your imagination: your ears and nose actually get larger over your lifetime. Unlike bones, which stop growing after puberty, ears and noses are made of cartilage. Over time, gravity pulls this cartilage downward, while the collagen and elastin fibers that support it begin to break down and stretch, making these features physically longer and wider.
Being watched changes how you perform. Known as social facilitation, an audience boosts performance on simple, well-rehearsed tasks by increasing physiological arousal. However, that same arousal impairs performance on complex or unfamiliar tasks. In 1969, psychologist Robert Zajonc famously demonstrated that this instinct is hardwired across biology: even cockroaches ran faster through simple straight tubes when other cockroaches watched from transparent spectator boxes, but faltered in complex mazes.