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What’s that sound? Depending on whom you ask, the crackle of popping joints is either the sound of sweet relief or the noxious tones of a stomach-turning habit. Really, though. What’s that sound? I mean, why does bending your joints in a certain way make them pop like that? Scientists have offered several explanations, including …
You may know that it takes light a zippy eight minutes to reach us from the surface of the Sun, so how long do you think it takes light to travel from the Sun’s core to its surface? A few seconds or a minute at most? Well, oddly enough, the answer is many thousands of …
There’s a common misconception that if you like to meticulously organize your things, keep your hands clean, or plan out your weekend to the last detail, you might have OCD. In fact, OCD, which stands for obsessive compulsive disorder, is a serious psychiatric condition that is frequently misunderstood by society and mental health professionals alike. …
You probably know the feeling. Your phone utters its final plaintive “bleep” and cuts out in the middle of your call. In that moment, you may feel more like throwing your battery across the room than singing its praises, but batteries are a triumph of science. They allow smartphones and other technologies to exist without …
When you picture a spaceship, you probably think of something like this, or this, or maybe this. What do they all have in common? Among other things, they’re huge because they have to carry people, fuel, and all sorts of supplies, scientific instruments, and, in rare cases, planet-killing lasers. But the next real-world generation of …
Will future spacecraft fit in our pockets? – Dhonam Pemba 더 보기 »
Maybe you’ve recently seen the phrase “gluten-free” on food packaging, or take-out menus, shampoo bottles, apartment listings, the tag of your shirt, on a hammer, as a lower back tattoo, or in your friend’s resume. Next time someone starts telling you about their newfound freedom from gluten, here are some questions you can ask, and …
Just now, somewhere in the universe, a star exploded. There goes another one. In fact, a supernova occurs every second or so in the observable universe, and there is one on average every 25 to 50 years in a galaxy the size and age of the Milky Way. Yet we’ve never actually been able to …
In the 18th century, Swedish botanist Carolus Linnaeus designed the flower clock, a timepiece made of flowering plants that bloom and close at specific times of day. Linnaeus’s plan wasn’t perfect, but the idea behind it was correct. Flowers can indeed sense time, after a fashion. Mornings glories unfurl their petals like clockwork in the …
Imagine an island where 100 people, all perfect logicians, are imprisoned by a mad dictator. There’s no escape, except for one strange rule. Any prisoner can approach the guards at night and ask to leave. If they have green eyes, they’ll be released. If not, they’ll be tossed into the volcano. As it happens, all …
Can you solve the famously difficult green-eyed logic puzzle? – Alex Gendler 더 보기 »
In 1895, a physicist named Wilhelm Roentgen was doing experiments with a cathode tube, a glass container in which a beam of electrons lights up a fluorescent window. He had wrapped cardboard around the tube to keep the fluorescent light from escaping, when something peculiar happened. Another screen outside the tube was glowing. In other …
