This moment required a GIF.
my birthday is tomorrow! wow!
The Mongol Empire existed during the 13th and 14th centuries, and was the largest contiguous land empire in human history.
"Spilled Dreams (lights off)" Gif
This reminds me of listening to Night Vale- even though this is exactly not that.
Maya Angelou doing a little reading in her dressing room before her performance at the Village Vanguard in New York City. Long before she was a poet and writer and the icon we know today, Dr. Angelou was a dancer and singer of folk and calypso songs (she even recorded an album in 1957 called “Miss Calypso” and appeared in the film “Calypso Heat Wave” that same year. This photo was taken by G. Marshall Wilson, who was a staff photographer at Ebony for 33 years. Photo: Art.com
When considering fluid motion, there are many ways to describe trajectories through the flow. One is the pathline, the trajectory followed by an individual fluid particle. Imagine releasing a rubber duck down a stream. Following the duck’s position over time would give you a pathline. Now imagine that instead of releasing a single rubber duck you release lots of them - say one every half-second from the exact same starting spot. You would end up with a line of rubber ducks stretching downstream, each of them sharing the same origin but with a different starting time. This is called a streakline. Would the streakline of rubber ducks follow the same trajectory as the lone duck? Not if the flow is time-varying! In fact, for unsteady flows, pathlines and streaklines can give completely different pictures of a flow, as illustrated in the video above. Knowing and understanding the difference between these types of trajectories is extremely important when it comes interpreting flow visualizations in unsteady flows because some visualization methods produce pathlines and others produce streaklines. (Video credit: V. Miller and M. Mungal)