The simplest invisible inks consist of organic compounds like lemon juice, vinegar, diluted honey, and even white wine– all substances that subtly weaken paper fiber. Once the liquid dries, it’s undetectable under normal circumstances. Apply heat, however, and the hidden message seems to appear out of nowhere. Organic ink makes the painted area more susceptible
Did you know that astronauts on the International Space Station (ISS) experience about 90% of the gravitational acceleration that we feel on Earth’s surface? That might seem strange, especially since when we look at them, they are always floating around. While this makes it tempting to say that there is no gravity in space,
Electric generators change mechanical energy into electrical energy. An electric motor does the opposite: it changes electrical energy into physical motion. This conversion is possible because of the Lorentz force. Electricity is just the movement of electrons through a loop, called a circuit. Ever notice how magnets can repel or attract objects without touching them?
As far as we can tell, the ocean has been slightly basic for hundreds of millions of years. However, that seems to be changing, and the culprit may surprise you. Everyone has heard of carbon dioxide. It’s the thing we breathe out, what plants crave, and there’s this thing called the greenhouse effect which you’ve
Why is it so hard to pick the perfect bracket? Let’s take a look at the mathematics of March Madness!! This year’s complete printable March Madness bracket by ESPN. It all comes down to probability. Let’s start by making things simple before we truly delve into the madness. Imagine two perfectly even teams are about
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