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# Posts tagged physics

### The Perfect Temperature For Coffee

Today on A Moment of Science, we’re going to take a moment to think about coffee and specifically about the importance of water temperature when brewing coffee.

### NASA’s Twin Study

Mark and Scott Kelly are identical twin brothers who are both NASA astronauts. In 2015, Scott Kelly was launched on a record 340 day mission to the International Space Station.

### Coffee Cup Convection

Convection is a common process in nature, and occurs when warmer air or liquid lies under a cooler layer. This is what happens in a coffee cup: the coffee on top is cooled by evaporation, and since cooler is also heavier, gravity pulls it toward the bottom.

### Don’t Try To Cross A Cross Sea

On the beach at Île de Ré, a small island off the west coast of France, there are square waves. This is the result of two sets of wave intersecting at right angles.

### A Spoon’s Double Vision

Look at the back of a spoon and your reflection appears right side up.  Look into a spoon’s bowl, and your reflection’s upside down. How come?

### Clouds In The Kitchen

Steam is water that’s heated to two hundred twelve degrees Fahrenheit.  Believe it or not, steam is invisible; you can see right through it.

#### August 13, 2019

A “heiligenshein,” is German for halo.  This is a glowing light around the head and shoulders of your shadow. It’s likely to be seen by early morning golfers on dewy grass.

### When The Sky Turns Green

As sunlight enters our atmosphere, it bends slightly.  This is due to refraction, the same thing that makes a pencil look slightly askew when you stick it half way into a glass of water.

### Rain On The Rear Window

If you glance back at the rear window while driving through a rain shower, you’ll notice that while raindrops batter the front windshield, they seem to avoid the back window as long as the car is moving.

### The Physics Of Setting Grapes On Fire

If you cut a grape in half and put the two halves in the microwave so that they’re touching each other, it will produce a glowing fireball.

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