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.
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.
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.
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.
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?
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.
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.
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.
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.
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.