One microscopic cell in our body is just one of trillions. In it, there are organelles capable of complex processes such as anabolism, autophagy, phagocytosis, and copying of genetic material. A single flagella is made of nine doublets of microtubules, which are arranged in a ring and connected to a central pair by radical spokes. Dynein extends from one pair of microtubules to the next, and by using ATP, dynein arms slide past each other to move, thereby causing the flagella to bend. Dynein also carries substances through the cytoskeleton from one part of the cell to the other, such as a signal in a nerve cell. How fast does the signal travel from one side of the cell to the other, and through several thousand cells to our brain, if it takes us a fraction of a second to realize an object is hot to the touch? As I'm sitting here typing this, my brain is thinking, my blood is pumping, my heart is beating... My body is constantly working. And it's doing the same thing for you. And seven billion other people.
And then there are forces that can change the surface of the earth in a matter of minutes, forces that can wipe out entire cities and even split apart continents. They don't care about us, about any of us. An earthquake of magnitude 7.0 can shut a door at 700 miles per hour. An earthquake of magnitude 9.4 can drive a glass shard 5 inches deep into an oak desk. An earthquake of magnitude 9.8 can hurl the ground up and down for 2 and a half minutes, rising 30 feet each time with incredible speed. The Earth's crust can shift an inch at any given moment, and we can bid farewell to our dearly beloved, all our belongings, our hobbies, all that time we spent on absolutely anything, and all we've ever hoped for and dreamed of.
And then there are forces that can change the surface of the earth in a matter of minutes, forces that can wipe out entire cities and even split apart continents. They don't care about us, about any of us. An earthquake of magnitude 7.0 can shut a door at 700 miles per hour. An earthquake of magnitude 9.4 can drive a glass shard 5 inches deep into an oak desk. An earthquake of magnitude 9.8 can hurl the ground up and down for 2 and a half minutes, rising 30 feet each time with incredible speed. The Earth's crust can shift an inch at any given moment, and we can bid farewell to our dearly beloved, all our belongings, our hobbies, all that time we spent on absolutely anything, and all we've ever hoped for and dreamed of.
Life is so fragile. Take care of it.