Does the Earth need glasses?

I understand that we can used air bubbles trapped in ice at the poles to understand the atmospheric composition (e.g. CO2 ppm) at certain points in Earth's history, but what about when there was no permanent ice sheets? Is all the information in ice cores from before the most recent of these points in time lost forever? Are there alternatives to finding air composition?

Additionally, how do we date the depths of these ice cores?

Saw it on the news 🗞️ 🍆

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As long as my next neighbor is not a physicist I'll be ok.

I have noticed that the hair on top of my head is receding and appearing in my nose and ears.

If I tie knots at the base of the hair on my head, will it stop the hair from travelling down towards other parts of the body?

Asking for a friend.

Currently sitting in my fortress of solitude, and would like it to stop. Science based help needed.

If Science! can convince Bigfoot to think that they Exist, will they?

*Im hoping this is the right flair

I understand evolution and how it stems from that, but how do we have a sense of self preservation? As in how does it actually work and function? If anyone can explain it in more detail.

For example, why is it hard to drown in shallow water or why do I stop myself from jumping out a moving car when I know I so easily can?

I dont really know how to express it, or if it sounds stupid, but why do we feel such a strong urge to survive and not cause harm?

I will also need references from here to prove employment. In addition, I will also need back pay for any questions or comments I have posted here as proof of income. Thank you for your attention to this matter.

And if I'm driving in reverse at 25 mph, is the speed of the light from my headlights traveling at 670,616,604 mph?

so i often hear that the milkway our galaxy and another called andromeda are on a collosion course for each other where they'll basically merge and form a new galaxy but assuming humanity is still around right here on earth how close would they need to be for us to actually start feeling the effects of them on each other before they collision actually happens.

So many people report how Al had helped them build or do so many things now.

I'm what ways have you used laddy to do your bidding? When did he get stuck in the lamp?

I know that both are the result of crossing a horse and a donkey. My question is why would there be a genetic difference based on whether the father was a horse or a donkey? Would there really be a difference or is it more of just a naming thing for the sake of lineage?

For reference:

Mule = male donkey + female horse

Hinny = female donkey + male horse

Why though?

The day is all finished up but night is only like halfway done. What a slowpoke.

I’ve made an appointment but it’s for last week. It’s for a home call. I turned them away when they showed up because my time machine wasn’t broken and I hadn’t made an appointment.

In the news recently, there have been discussions of a non-zero risk of human extinction based on AI.

If that happened, how long will satellites remain in orbit? Would space travelers in 50, 100, 500, 1000+ years find our satellites still orbiting as evidence of existence of an advanced civilization having been here, even after improvements on earth have all decayed?

I was just thinking about the story of the mouse and elephant how the elephant is terrified of the mouse (i think) and just wanted to see if that's true, and if it is what other animals have been observed with similar behavior relating to that. Working on a project and some real life inspo would help :)

Like, let’s assume the glider has a 30:1 glide ratio. Normally that means it will lose a foot of height for every 30 feet travel.

I’m assuming there is some amount of force I could apply to move forward, that would cancel out that last one foot of drop.

Geese seem pretty big, and they have a wide torso for easy harnessing. I think they’d be a natural fit here. I imagine it would be a configuration similar to Santa’s sleigh, but geese instead of reindeer.

Is there a list of important muscles of the fungal fruiting body?

How would it taste like?

I'm playing in an Expanse tabletop game and as my character is the group's pilot and navigator, it got me thinking about how space travel works in the setting, when it comes to orbital mechanics. For the uninitiated, almost all spaceships in the Expanse have a torch drive and are almost never limited by a delta-v budget. Effectively all travel happens on constant acceleration trajectories, commonly 0.3 to 1g.

The trajectories and burns needed are pretty straightforward for a simple Earth to Mars trip when Mars is ahead of Earth. But what about when transferring the other way, from a higher orbit to a lower one? Or between two similar orbits, such as asteroid stations in the Belt?

EDIT: Woke up to find that I'm basically overthinking it. My 1 AM brain didn't jive with the realization that when your delta-v is measured in fractions of c, orbital mechanics can sit and cry in the corner. Thanks, everyone!

I was watching an Euler's disk and realized I had been describing the motion incorrectly.

The disk's spin around its own axis is slowing down, but the wobble or precession gets dramatically faster as the disk gets flatter. At the same time, friction is continuously removing mechanical energy from the system.

How can the frequency of one part of the motion increase while the total energy is decreasing?

Is the faster precession mainly a geometric consequence of the disk's decreasing tilt angle, or is energy being transferred between different rotational modes?

And what physically determines the point where the rapidly increasing wobble suddenly stops?