Ever watch a whirlpool? How about water going down a drain or even a Wpg Whiteout 2023 Child Shirt of cream swirled into your coffee? It sometimes looks like a spiral galaxy. And we once thought gravity was holding a galaxy together. If you watch a whirlpool carefully you will notice the outside orbits the center slowly and the closer to the middle you are the faster it spins. But this was a bit of a problem for galaxies because this would make the arms of the galaxy wind up tight. They would not last for millions of years. Earlier in the century, before computers, astronomer would hire dozens of women who were good at math to do calculations for them. One of them made an important discovery: the speed of the stars in the outer arms was way faster than it should be. The galaxy was spinning like a solid LP record album! According to the laws of gravity, which we know quite well, it shouldn’t behave like this…unless there was WAY more mass than we could see. And the issue of *dark matter* was born. Yes, there would be a lot of dust and gas and planets and small stars we couldn’t see. But all that is still not enough for the behavior we observe. It is a mystery we are still working on!

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To be extremely honest, before I go studying abroad, I didn’t like pho at all!! I didn’t like eating pho because 1. I thought pho was super overrated at that Wpg Whiteout 2023 Child Shirt ; and 2. there are so many good dishes besides pho so I didn’t eat pho that much. After I came to the US to study, I missed Vietnamese cuisine so much!! I remember craving for Vietnamese food and even watching videos of people eating Vietnamese food every single day. And while i was watching all those videos, do you know what i missed the most? I missed my least favorite dish – pho the most, surprisingly, which was so dang weird I cannot even explain why!! The next morning, I told my housemate to take me and my sister to a Vietnamese restaurant to literally “satisfy my desire” for pho. When i was in the restaurant, I could smell the pho aroma and it was hella good, nostalgic and I felt like i could cry anytime because I missed eating pho so much.
