Evolution endowed us with intuition only for those aspects of physics that had survival value for our distant ancestors, such as the parabolic orbits of flying rocks (explaining our penchant for baseball). A cavewoman thinking too hard about what matter is ultimately made of might fail to notice the tiger sneaking up behind and get cleaned right out of the gene pool. Darwin’s theory thus makes the testable prediction that whenever we use technology to glimpse reality beyond the human scale, our evolved intuition should break down. We’ve repeatedly tested this prediction, and the results overwhelmingly support Darwin. At high speeds, Einstein realized that time slows down, and curmudgeons on the Swedish Nobel committee found this so weird that they refused to give him the Nobel Prize for his relativity theory. At low temperatures, liquid helium can flow upward. At high temperatures, colliding particles change identity; to me, an electron colliding with a positron and turning into a Z-boson feels about as intuitive as two colliding cars turning into a cruise ship. On microscopic scales, particles schizophrenically appear in two places at once, leading to the quantum conundrums mentioned above. On astronomically large scales… weirdness strikes again: if you intuitively understand all aspects of black holes [then you] should immediately put down this book and publish your findings before someone scoops you on the Nobel Prize for quantum gravity… [also,] the leading theory for what happened [in the early universe] suggests that space isn’t merely really really big, but actually infinite, containing infinitely many exact copies of you, and even more near-copies living out every possible variant of your life in two different types of parallel universes.
Take a shower. Wash away every trace of yesterday. Of smells. Of weary skin. Get dressed. Make coffee, windows open, the sun shining through. Hold the cup with two hands and notice that you feel the feeling of warmth. 
 You still feel warmth.
Now sit down and get to work. Keep your mind sharp, head on, eyes on the page and if small thoughts of worries fight their ways into your consciousness: threw them off like fires in the night and keep your eyes on the track. Nothing but the task in front of you. Get off your chair in the middle of the day. Put on your shoes and take a long walk on open streets around people. Notice how they’re all walking, in a hurry, or slowly. Smiling, laughing, or eyes straight forward, hurried to get to wherever they’re going. And notice how you’re just one of them. Not more, not less. Find comfort in the way you’re just one in the crowd. Your worries: no more, no less.Go back home. Take the long way just to not pass the liquor store. Don’t buy the cigarettes. Go straight home. Take off your shoes. Wash your hands. Your face. Notice the silence. Notice your heart. It’s still beating. Still fighting. Now get back to work.
Work with your mind sharp and eyes focused and if any thoughts of worries or hate or sadness creep their ways around, shake them off like a runner in the night for you own your mind, and you need to tame it. Focus. Keep it sharp on track, nothing but the task in front of you.Work until your eyes are tired and head is heavy, and keep working even after that. Then take a shower, wash off the day. Drink a glass of water. Make the room dark. Lie down and close your eyes.
Notice the silence. Notice your heart. Still beating. Still fighting. You made it, after all. You made it, another day. And you can make it one more. 
You’re doing just fine.
You’re doing fine.I’m doing just fine.