I may be a purist, but I never lie to my children. You don't have to. From birth, I have told my kids that Santa Claus is not a real person but is a real symbol of giving, and the tooth fairy is not a real fairy but is a real symbol of growing up, and the Easter bunny... My kids handled it fine.
I can't tell if you are being sarcastic. The pen strokes in the first two frames are gorgeous but the pen strokes on their faces in the last frame are awful: beginner-level cringe. (But was it bad on purpose as part of the narrative?) I teach an art class at my uni and I'll include this in lectures.
Image of CNN article link with headline "Five seconds of free fall: Astronauts describe historic moon mission - and nail-biting return to Earth."
Technically, the Artemis astronauts were in "free fall" during 99% of their 9-day journey to the moon and back, but during the seconds when they were re-entering Earth's atmosphere and fireballing, they were not in free fall.
One thing to keep in mind: As an interactive website becomes more popular (more users & more posts), inefficiencies in the code become more serious and have to be improved.
Cool. A silly question here, but why write out the constants as C1 + C2 +...? The sum of a bunch of unknown integration constants is just one unknown integration. Why not just write +C at the very end?
I lived in Germany for 2+ years and became mostly fluent in the language. I came back to the US and went to college and took a 300-level German course for fun (it was the lowest course you could take if you're already fluent in the language). That course was *so* hard. It's focus was literature.
When I write, using the em dash is my passion. I refuse to stop using it—even if AI abuses it. I have to limit myself to using the em dash to threes times per page—at most—so that I don't overuse it.
If you pretend that the word "weight" does not exist, then students will be confused/misled when in everyday life they come across statements like "astronauts in orbit experience weightlessness."
I use the word "weight" (but sparingly!) in my class not because it's a good word, but because it's important to connect physics concepts to everyday experiences and language. I am careful to distinguish "true weight" (the force of gravity) from "apparent weight" (what you feel that you weigh).
Cool, but to be clear, the moon doesn't have to be exactly 400x closer to the earth than the sun for total eclipse, it just has to be *less* than 400x closer. In other words, total eclipses of a host star by a moon as seen from the moon's planet are more common than this makes it sound.
When I first got hired as a tenure-track professor, I asked colleagues for advice and one said: Buy your regalia immediately. It's expensive, but you'll want to do it eventually, so you might as well do it now and avoid renting, borrowing, feeling second-rate, etc. Wise words that I followed.
Same here. I used to present the exam's grade distribution histogram to students (to prove to them that my test was not impossibly hard, because some people did well). But then years ago I stopped doing that because it's irrelevant to a student how the other students are doing.
No, not in class. IMHO, there's too much material to cover and not enough time available to use up class time going over exam solutions. Also, many of the students go an "A" and it's a waste of their time to see solutions that they already know. I instead encourage students to come to my office.
Yes! I already changed my computer's background image be one of the photos snapped by #ArtemisII yesterday, and it looks gorgeous, like it belongs there and will always be there.
... and building machines that can make observations that human eyes cannot make directly, and developing models that can successfully predict the observations, and making hypotheses and testing them with observations.
science is really just reporting observations
Yes, but that's just seems true locally. They and their spacecraft are currently falling *down* toward the moon, literally (don't worry - they'll miss).
Hello, physicist here. I am fully converted to using Julia for all of my research. It makes farming out a calculation to many computers/cores at once ridiculously easy.
In my view, histories of science books by scientists tend to get the history wrong/oversimplified, while those written by historians tend to get the finer details of the science wrong, which often goes unnoticed by general readers but is infuriating to scientist readers. Joint-written books are best
This turned out better than I expected. Happy Pi Day!
On the moon, g is 1.625, so according to your logic, pi = 1.27 on the moon. You can't simultaneously choose L = 1 m and T/2 = 1 s. By doing so, you are treating pi as an adjustable parameter. Rather, to get T/2 = 1 s on earth (which is a grandfather clock) and with true pi, you need L = 0.994 m.
Thanks for bringing this to light. For what it's worth, learning to take care of livestock is an important part of education in rural communities, as many of those kids will grow up to be farmers and ranchers. I'm not saying that school vouchers should necessarily pay for it.
A chain link fence with fine, needle like ice crystals growing all over the chain. Morning sun shines the from the other side of the fence.
Seen on this morning’s walk
I'm old enough to remember that. Call me weird but I disliked full-service gas stations and would drive the extra distance to get to a self-service one. I didn't want to have to chat with a stranger just to fill up with gas. (I'm introverted.) Also, I didn't want to feel guilty for not tipping.
That's interesting. Along these lines, years ago I walked past a billboard ad in Germany that stated "Genuine American Pizza" and had a 30-ft tall photo of a pizza covered with whole-kernel corn.
My TED-Ed video on lasers is finally published, and it already has 121,000 views on YouTube.
www.youtube.com/watch?v=cmO2...
I can confirm it's real. Also, for some reason, the official pronunciation is "water-burger."
On a related note, at my old college they tried to prevent people from touching the large open-air Foucault pendulum and messing it up by posting an official-looking sign that says, "Warning: 10,000 Ohms."
Cool, but it's not diffraction. There are multiple lights beyond the door at different locations, each creating its own beam of light through the crack. It's effectively a pinhole camera. For incoherent visible white light, you need a way smaller slit than that to get noticeable diffraction.
I've been converted to sturdy paper gift bags. It takes three seconds to pop the gift in the bag, and we reuse the bags year after year, which is better for the environment and saves us money.
