u/Several-Setting-4173

I was going down a random genetics rabbit hole last night when a thought hit me.

If I go back far enough in my family tree, there are hundreds, even thousands, of people who are my ancestors. But every generation only passes down a portion of their DNA, and that DNA gets shuffled around each time.

That made me wonder: is it possible that some of my ancestors are still part of my family tree, but I don't carry a single piece of their DNA anymore?

In other words, could someone's genetic contribution completely disappear over the generations, even though they're directly responsible for me existing today?

The idea feels strange. How can someone be your ancestor, yet leave no detectable DNA behind in you?

Is that actually how genetics works, or am I misunderstanding something?

A few days ago, I was getting a haircut and started thinking about something that had never really crossed my mind before. We spend so much time and money taking care of our hair. Some people are proud of it, some worry about losing it, and entire industries exist around keeping it healthy. Yet most of us rarely stop to think about why humans have hair in the first place.

The more I thought about it, the stranger it seemed. Hair clearly serves important purposes. The hair on our heads helps protect us from direct sunlight and temperature extremes. Eyebrows keep sweat from running into our eyes. Eyelashes help block dust and other particles. Even body hair can act as a sensory system, helping us detect insects, movement, or changes in our surroundings. From a survival standpoint, hair doesn't seem useless at all.

But then I started thinking about other mammals. Most mammals are covered in fur because it helps them survive. Fur provides insulation, protection from the environment, and in some cases even camouflage. If hair is such a useful evolutionary tool, why are humans so different? Compared to almost every other mammal, we're surprisingly hairless. We lost most of the thick body hair that our ancestors likely had, yet we kept a large amount of hair on our heads and in a few specific areas.

That feels like a very specific evolutionary choice. If body hair was important, why lose so much of it? If it wasn't important, why keep any of it at all? Why keep thick scalp hair while allowing most of the rest of the body to become relatively hairless? It seems like there must have been a significant advantage that outweighed the benefits of being covered in fur.

I've read a few theories. Some suggest that losing body hair helped early humans stay cool while walking and running long distances in hot climates. Others argue that sexual selection played a role, with less body hair becoming a preferred trait over many generations. I've also seen arguments that reduced body hair made it harder for parasites such as ticks and lice to thrive. But none of these explanations feels completely satisfying on its own.

So I'm curious what people who know more about evolution, anthropology, biology, or human history think. What is the most convincing explanation for why humans evolved to lose most of their body hair while keeping the hair on their heads? Was it mainly about temperature regulation, disease prevention, attraction, or something else entirely? And if losing body hair was such an advantage, why did evolution stop halfway instead of making humans completely hairless?

I'd love to hear both scientific explanations and personal theories. It's one of those everyday things that seems simple at first, but the more I think about it, the more fascinating it becomes.

Yesterday, I was traveling through Delhi Metro when a woman who looked to be in her 50s approached me at Rajiv Chowk. She seemed nervous and asked for help getting to Inderlok. I helped her figure out the route and later showed her the correct line at Kashmere Gate. After that, she told me she didn't have money for an auto-rickshaw and asked if I could help. I gave her ₹40 because it wasn't a large amount and she seemed genuinely worried. A few minutes later, I noticed her talking comfortably with another person and then walking into a shop with him. That immediately made me wonder if I had just fallen for a scam. What made me even more suspicious is that a few months ago I had a similar experience. A guy approached me and claimed his phone was broken, so he couldn't contact anyone, and asked if I could lend him some money. At the time, I helped him too. I'm not bothered about the money itself, but it's strange that I've now run into two different people with emergency stories asking for cash. Maybe they were genuinely in need, or maybe these are common scams that rely on people's kindness. Has anyone else in Delhi Metro experienced something similar? Is this a known scam, or am I just being overly suspicious?

I recently traveled from Delhi to Bangalore for International Yoga Day, and the trip was a reminder of how much travel teaches you things that you never think about beforehand. When I first started traveling, I honestly thought all luggage was pretty much the same. As long as it looked decent and had enough space for my clothes and essentials, I was happy. I never paid much attention to wheel quality, handle comfort, weight, or how the compartments were organized. This trip was different. Between moving through the airport, waiting in lines, walking long distances, and carrying my bag around more than expected, I found myself noticing all the little things that can either make travel easier or more frustrating. Some features that seemed unimportant when I bought the bag suddenly felt like a big deal, while a few things I thought mattered turned out to be irrelevant. It got me thinking about how our priorities change with experience. The longer we travel, the more we start appreciating small practical details that never show up in advertisements. For those who travel regularly, what's one luggage feature you didn't care about when you started traveling but now consider essential? And is there anything that brands focus on that you've found doesn't really matter in real-world travel?

I want to present a thought experiment and I am open to being corrected or having my view changed

If animals could communicate with humans in clear language like we do with each other and express their thoughts emotions fear trust and awareness in a way we fully understand then I believe the current system of industrial slaughter would either collapse or undergo a massive transformation

The reason I think this is not because people would suddenly become fundamentally different but because a major psychological barrier would be removed which is silence

Right now most humans never directly experience the internal perspective of animals in a communicable way so there is a natural emotional and mental distance between the consumer and the process and that distance makes it easier for the system to function at scale without constant emotional conflict

But if that distance disappears and animals can clearly express what is happening to them in real time then I feel it would become extremely difficult for the system to remain unchanged at the same scale because the experience would no longer be abstract or distant but direct and understandable in human terms

I am not saying this as a moral judgment I am just trying to explore how much of our current food structure depends on the inability of animals to communicate their experience in human language and how much of it is built around that separation

I have already quite nonveg food in my past and recently I have been thinking more about living closer to nature which is what led me to this question and this line of thinking

CMV I feel like either industrial slaughter would shrink significantly or the entire system would need to be completely redesigned if animals could speak

I am open to hearing arguments that disagree with this or show why this assumption might be wrong

I had no idea what CBT was either until I started working in a corporate job. At first, I thought the stress, overthinking, and communication problems were just part of office life. Every time my manager sent a short message like "Can we talk?" I would immediately assume I had done something wrong. If a colleague didn't reply to my email, I would spend hours wondering if I had said something stupid. It felt like my mind was constantly creating worst case scenarios.

A friend suggested looking into CBT, and I learned that a lot of my stress wasn't coming from the actual situations but from the stories I was telling myself about them. CBT helped me notice those automatic thoughts and question whether they were really true. Instead of assuming my boss was upset, I learned to look at the facts. Instead of replaying every meeting in my head, I focused on what was actually said rather than what I imagined people were thinking.

Over time, my communication improved because I became less defensive, less anxious, and more confident when speaking up in meetings. The situations at work didn't magically change, but the way I processed them did. For me, CBT felt less like therapy and more like learning how to stop my brain from turning every small workplace interaction into a crisis.

I recently watched a video that I honestly wish I had never seen. It showed a cow being slaughtered, and the cow appeared to be pregnant. Afterward, the unborn calf was removed and killed as well. Seeing that affected me deeply.

What disturbed me most was how routine it all seemed. The workers didn't appear to treat the animals as living beings with any value beyond being products. It felt as if there was no difference between handling something alive and handling an object, and that really stayed with me.

Since watching the video, I've stopped eating meat because I can't get those images out of my head. I'm not trying to attack or judge anyone who eats meat. I'm just wondering if anyone else has had a similar experience. Has witnessing something like this ever changed your perspective on meat, or do you see it as an unfortunate but necessary part of food production? I'm genuinely interested in hearing different viewpoints.

For nearly 5 years I regularly consumed whey protein and non veg food because I genuinely believed they were essential for building muscle maintaining strength and staying fit. Everywhere I looked whether it was fitness influencers gym trainers or social media the message was always the same. If you want to build muscle and keep your physique you need plenty of protein and supplements can make a huge difference. About a year ago I decided to stop both whey protein and non veg food completely. It was not for any health issue or personal reason. I was simply curious to see how my body would react without them and whether all the claims I had heard for years were actually true in my case.

I honestly expected to lose muscle mass feel weaker during workouts recover more slowly and maybe even lose some weight. Instead none of those things happened. Over the past year I have stayed in shape continued training regularly and have not noticed any major decline in strength or performance. If anything I feel more energetic throughout the day and my body feels better overall. In some ways I even feel like I have made better progress than before. The experience has made me question a lot of what I used to believe about fitness nutrition supplements and the idea that certain products are absolutely necessary for everyone.

I know this is only my personal experience and I am not claiming that whey protein or non veg food do not work. But it has made me wonder how much of the fitness industry is based on individual needs and how much is driven by marketing. Has anyone else stopped using something that was considered essential for health fitness or muscle building and discovered that it made little or no difference in their results? I would be interested to hear what happened and whether it changed the way you think about nutrition and fitness.