How To Trap a Laser
How To Trap a Laser

Ever notice how, when you look into rippling water, you see slices of what’s below the surface mixed with broken reflections of the world above? When light hits a boundary between two different media, it can either travel ahead into the second medium (refraction), bounce back into the first (reflection), or do a little of

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Levitate a Soda Can
Levitate a Soda Can

Did you know that Bernoulli’s principle is a statement of conservation of energy? The sum of kinetic and potential energy is constant in every closed system. In fluid dynamics, potential energy is an expression of the pressure within a volume of liquid or gas. When a fluid moves faster (its kinetic energy increases), pressure (potential

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DIY Fireproof Cash
DIY Fireproof Cash

We soaked this $5 bill in flammable rubbing alcohol and then lit it on fire. So how did it survive? Does it have something to do with the bill itself? This demonstration is impressive with money, but we haven’t been able to find an example of it using other materials. Many people have asked us

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The (Almost) Invisible Fuse
The (Almost) Invisible Fuse

When you light a candle, wax melts and travels up the wick via capillary action. As it gets close enough to the heat source, the wax vaporizes and ignites, providing more heat, which melts more wax, which is wicked up into the flame in turn. The cycle continues until fuel runs out, oxygen is depleted,

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Lightning Electricity in the Palm of Your Hand
Lightning Electricity in the Palm of Your Hand

During a thunderstorm, lightning often appears to flash instantaneously from cloud to ground, but there’s much more going on than meets the eye! Friction between air currents causes a buildup of negative charge in the lower parts of the clouds. Like charges repel each other, so the excess negatives begin developing an escape route. Strong,

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