Summer is upon us and so many people's thoughts turn to ice cream. Here are
some paintings of ice cream still lifes, ice cream shops, and people eating
ice cream. As you enjoy your summer be sure to give yourself some ice
cream headaches along the way.
The genesis of this post was muons. They are created when cosmic rays strike particles in the outer atmosphere. They are extremely short lived (~2 microseconds) and so logic would tell you they should not last long enough to travel the distance from their creation to the Earth's surface. However, since they are traveling at near the speed of light the time dilation and length contraction predicted by relativity comes into play and they can make the journey.
So, what's this traveling at the speed of light business and the relativistic effects that so effect the muons? The above video, inspired by Lewis Carroll Epstein's book Relatively Visualized, gives a nice and simple explanation of it. I did like the enthusiasm of the presenter.
Gustave Caillebotte
was a 19th century French impressionist painter. He came from a wealthy family
and so he did not need to paint to support himself. In fact, he retired from
painting in his mid-30s to pursue his other interests. Along with his works,
one of his major contributions to the impressionist movement was financially
supporting a number of other painters including Monet, Degas, Renoir and
others.
This is a walk in Bandung, a provincial capital on the island of Java in Indonesia. The walk is though the downtown commercial area which is clean and well maintained. I think it is a bit of a local tourist destination. At one point you see a lot of people in costumes, mostly ghosts. I'm not sure what that was all about.