Recent comments in /f/askscience

Bsoton_MA t1_ja50hf0 wrote

Reply to If the fuel that goes in car engines is extracted from hydrocarbons, which consist of only Hydrogen and Carbon, and those hydrocarbons react with Oxygen in the air (combustion reaction), to produce CO2 and H2O, why do we get a bad smell from car exhaust fumes if both gases are odorless? by Protoflare

Gasoline has a little bit of sulfur from petroleum. When sulfur combusts it forms sulfur dioxide which smells. A catalytic converter should prevent this, which is why it does not smell as bad as with one.

Edit: without —> with

11

Drink15 t1_ja4zrsq wrote

Reply to comment by supreme_harmony in If the fuel that goes in car engines is extracted from hydrocarbons, which consist of only Hydrogen and Carbon, and those hydrocarbons react with Oxygen in the air (combustion reaction), to produce CO2 and H2O, why do we get a bad smell from car exhaust fumes if both gases are odorless? by Protoflare

There is also oil that get past the seals and burns with everything else. It’s a small amount in new cars but increases as motor wears

81

Invisible_Sharks t1_ja4uxgp wrote

Reply to Is there any evidence suggesting that Covid-19 can affect the immune system, increasing chance of illness from other viruses? by stacybobacy

Thank you for your submission! Unfortunately, your submission has been removed.

We do not offer medical advice on /r/AskScience. Please see our guidelines. If you have concerns about your or someone else's health, you need to speak to a medical professional. We also cannot evaluate the safety of commercial products or how healthy a specific practice is.

If you disagree with this decision, please send a message to the moderators.

1

_Oman t1_ja4sxrg wrote

Reply to comment by stacybobacy in Is there any evidence suggesting that Covid-19 can affect the immune system, increasing chance of illness from other viruses? by stacybobacy

Even before COVID-19 there was evidence that fighting off a significant infection can cause a number of post-infection issues. Sometimes the damage is done by the infection, sometimes by the immune system fighting the infection, and sometimes the immune system can be dysfunctional after the infection. COVID-19 is unique in that is spread rapidly to a large portion of the population, and people had such a varied reaction to it.

Don't limit your research to COVID-19, although there has been a lot more research done in the past couple of years because of it.

​

https://www.thelancet.com/journals/landia/article/PIIS2213-8587(22)00324-2/fulltext

1

JosBenson t1_ja4q9zw wrote

Reply to comment by stacybobacy in Is there any evidence suggesting that Covid-19 can affect the immune system, increasing chance of illness from other viruses? by stacybobacy

It might be that due to lockdown we encountered a lot fewer viruses than we normally do, so that since lockdown has eased we are all back around each other and picking up viruses and bacteria. Our system has not had a chance to build immunity in the past 3 years as it would normally. See this article: https://www.nature.com/articles/d41586-022-03666-9

Which explains that: During pandemic-related lockdowns, it wasn’t just the spread of COVID-19 being halted. Inevitably, other infections also waned, as school children stayed at home, offices closed their doors and face masks became a normal public sight. Now, with societies opened up again, infections are on the rise, have become worse or more prolific because lack of mixing in kids and adults may have caused a drop in population-wide immunity.

4

WazWaz t1_ja4pual wrote

Reply to Water on Earth is not Constant. Why ? by ItsDivyamGupta

Take a step back. Matter cannot be created or destroyed (let's ignore E=mc² for now). So you must know the water doesn't just vanish. You've presumably seen the difference between a green leaf and a dead one (hint: the latter is dry).

Trees don't grow forever nor do they live forever, so I don't understand why you thought the water was trapped in them forever.

This is in addition to the chemical processes others have described which convert the water to and from plant matter via photosynthesis and respiration.

1