Crying

 The article “Crying a Lot Is Good for You, Actually: There are health benefits to letting it out. Here’s what being a Big Crier says about you.” by Carolyn L. Todd discusses how frequent crying can actually be beneficial for emotional and physical health. Here are the main ideas commonly highlighted in that piece.

1. Crying can regulate emotions

Crying is a natural emotional regulation mechanism. When people cry:

• It can help release pent-up emotions such as grief, frustration, or stress.
• After crying, many people report feeling calmer or relieved.

Scientists think this happens partly because crying activates the parasympathetic nervous system, which helps the body settle down after stress.

2. Tears may reduce stress

Emotional tears (different from reflex tears caused by onions or irritation) contain higher levels of stress hormones and proteins.

Some researchers believe crying may help the body flush out stress-related chemicals, though the science here is still debated.

3. Crying can strengthen social bonds

Humans often cry in front of others, and that can serve a social function:

• Tears signal vulnerability and need for support.
• Observers often respond with comfort and empathy.

So crying can help people connect and receive help during difficult moments.

4. “Big criers” may simply be more emotionally responsive

Being someone who cries easily doesn’t necessarily mean you’re unstable. It can reflect:

• higher emotional sensitivity
• stronger empathy
• a tendency to process feelings openly

Personality traits and cultural norms also affect how often people cry.

5. But context matters

Crying isn’t always beneficial.

• If someone cries constantly and feels no relief afterward, it can signal deeper issues such as depression or chronic stress.
• Social environments can also make frequent crying difficult or stigmatized.

✅ Bottom line:

Crying is a normal biological and psychological response that can help people process emotions, reduce stress, and connect with others. Being a “big crier” often just means you have a strong emotional response system, not that anything is wrong.

If you want, I can also explain the three different types of tears humans produce—and why emotional tears are chemically unique, which is a really interesting bit of biology.

Okapis have tongues long enough to wash their eyelids.

Koalagenetic bottleneck

 Koala populations went through an extreme genetic bottleneck in the late 19th and early 20th centuries. Heavy hunting for their fur reduced them to very small populations in parts of Australia. Normally, such a bottleneck leads to very low genetic diversity, which can cause disease vulnerability and reduced fertility. Yet koalas have managed to persist and expand again. Researchers have identified a few key reasons why.

1. Hidden genetic diversity in immune genes

Even though koalas have low overall genome diversity, they retained diversity in certain immune-system genes, especially the MHC (Major Histocompatibility Complex).

• MHC genes help the immune system recognize pathogens.
• Natural selection tends to preserve diversity in these genes even when the rest of the genome loses variation.
• This allowed koalas to still respond to diseases despite the bottleneck.

Result: functional diversity remained where it mattered most for survival.

2. Population recovery from multiple refuges

The bottleneck wasn’t equally severe everywhere.

• Some populations survived in separate refuges (especially on islands and remote forests).
• Later conservation and natural movement allowed mixing between populations.

When different small populations interbred again, their slightly different gene pools combined, restoring some diversity.

3. Rapid population growth after protection

After hunting was restricted in the early 1900s, koalas rebounded.

• Translocation programs moved koalas from surviving populations to new areas.
• Population growth increased the effective population size, slowing further genetic loss.

However, some reintroduced populations still have very low diversity because they came from only a few founders.

4. Tolerance to some diseases

Koalas are commonly infected with Chlamydia (koala disease) and Koala retrovirus.

Some populations appear to have genetic adaptations that help them tolerate or resist these infections. Natural selection likely favored individuals that could survive despite limited genetic diversity.

✅ In short:

Koalas didn’t fully “escape” the bottleneck genetically. Instead, they survived because:

• crucial immune genes kept diversity
• multiple small populations later mixed
• conservation efforts boosted numbers
• natural selection favored disease-resistant individuals

They still have lower genetic diversity than many mammals, which is why habitat loss, climate change, and disease remain major threats today.

If you’d like, I can also explain why koalas are a strange exception compared to species like the Cheetah, which went through a bottleneck but still show extreme genetic uniformity. The comparison is pretty fascinating.

Candle is body brain. Flame is C.

Living organism metabolism is a verb process not noun

Pablo Neruda, “You can cut down the flowers, but you can’t stop the spring.”

Bitter or Better

 You either get bitter or you get better. It's that simple. You either take what has been dealt to you and allow it to make you a better person, or you allow it to tear you down. The choice does not belong to fate, it belongs to you." 

~ Josh Shipp