The chemistry defines the voltage of the battery. Lithium operates anywhere from 3V to 4.45V or 1.5V.

The biggest challenge between chemistries is going to be energy density compared to other types, cost and sometimes weight and size.

Lithium is becoming battery leader in terms of chemistry, because it has a higher energy density, lower weight and can come in many form factors. The biggest downside is cost.

Alkaline has the benefit that it's low cost, decent for most cases in terms of size & weight ratios. NiCDs are heavier.

Energizer makes lithium AA/AAA that are 1.5V. The biggest benefit over alkaline is that those lithium batteries have longer runtime (also work better in cold). However, the lithium batteries are more expensive and you could probably buy more alkalines for the same cost.

It's worth mentioning that non-rechargables typically hold charge longer than their rechargable counterparts, the benefit of rechargable is that you shouldn't have to recycle rechargables away after it discharges. This means on one charge cycle, you'll have to charge the rechargable before the non-rechargable. Non-rechargables are quick to replace but you have to buy more over time.

With this in consideration cheap electronics typically come with alkalines AA/AAA because it's cost effective, provides the needed power and decent runtime and they don't care too much about you needing to replace the battery when it's discharged.

Technically, yes. It’s like ripples in a pond. Sound waves are energy, energy doesn’t just disappear. But it decreases significantly over distance, we’re talking down to 0.00000000…..1% of its initial intensity. Now try and pick that one specific wave out of every other noise that’s ever existed.

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It's not expanding into anything. The expansion of the universe is not the motion of stuff through space, nor is it the motion of space through... super-space or something of that sort. It is fundamentally different from motion. It's a metric expansion, meaning that there's brand-new space coming into being everywhere, all the time, and the distances between objects simply get larger (at a rate that is getting faster as time goes on).

During every cycle, the best egg at the time is released that has the highest chance of fertilization. This means there's competition every month which increases reproductive chances. If there were only 600 eggs then there wouldn't be competition and if a bunch of eggs were damaged for any reason then this would decrease reproductive chances and introduce unintended mutations.

When the ovaries develop in utero, there are about 6 million eggs in them. By the time the baby is born, there are 1-2 million. Before puberty, a girl loses about 10,000 eggs per month. After puberty, her hormones have a protective effect and she only loses about 1,000 a month.

After puberty, only one egg matures and drops per month; the rest just resorb.

This explains it in more detail: https://www.healthline.com/health/womens-health/how-many-eggs-does-a-woman-have#eggs-lost-each-month

Good question! I don't know, but it should be possible to multiply the standard CO2 proportion of air by the density of air at your altitude by the volume of air in the greenhouse (216 cubic feet for a 6'x6'x6' greenhouse with nothing in it) to get the mass of CO2 inside at a given time. If you wanted to raise that by 10%, you'd just add that mass of dry ice - it has the same mass whether solid or gas.

But, air exchange with the outdoors will equalize that concentration gradient eventually, perhaps even as fast as the dry ice sublimates. Even in an airtight greenhouse, the enhanced CO2 levels will benefit some plant groups more than others, in a way that changes with day length and temperature. Timing probably matters too, with some plants shutting their stomata in the day.

Of course they do make 3V batteries, like the “coin type” CR batteries that power watches. And really defeat OP’s “all electronics use 2 batteries” assertion

The main obstacle is that the water is too expensive for anything except for residential usage, and therefore does very little to solve the water shortage in the southwest.

To complete a stride, Achilles foot would have to move to half way through his stride, and to do that it would need to move half way to that , and so on.
That just shifts the thing down.

The universe having some kind of finite resolution like the planck length would also resolve this.
But it's not necessary, for the reasons stated above.

They "do" but they also don't. The voltage wasn't made specifically for the application but is rather what the chemistry can provide.

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The polarity is flipped for majority of storms. Commonly the storm is going to be - and the Earth is +. Though rarely it is possible for them to be the opposite.

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Lightning is basically static electricity between particles in clouds.

Normally the air/atmosphere is an insulator and doesn't allow current to flow. During a storm that produces lightning the voltage increases and starts to turn the air into plasma, which is conductive. Typically the biggest difference in charge is between the storm (-) and the ground (+), so the strike typically goes from the storm to the ground.

Thunder is the result of lightning. Basically it rapidly makes the air hotter and increases the pressure causing the air to expand quickly. The expansion of air is the sound of thunder.

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Or, they would need to affix two 1.5 volt batteries in series in one long battery, except TV remotes have batteries next to each other to save space.

The answer is that 1.5v batteries provide diversitility in how they are used and mounted in devices.

I always thought the soloution was e will pass when his indiviual strides are longer than the tortoises distance traveled during the time it takes Achilles to make one stride

Thunder and lightning happen when there is a buildup of electrical energy in the atmosphere during a storm. The storm clouds move around and create friction between each other, which causes the buildup of this electrical energy.

When the electrical energy becomes too strong, it is discharged in the form of lightning. Lightning is a giant spark that travels between the negatively charged bottom of the cloud and the positively charged ground.

The air around the lightning bolt heats up very quickly and expands rapidly, creating a shock wave that we hear as thunder. This is why we see the lightning first and then hear the thunder a few seconds later.

>Are you always this condescending to five year olds?

...you say, dipping with condescension

Basically, the ice crystals in a thunderstorm rub up against each other and generate a massive static charge. Once this static charge becomes large enough, it discharges to the earth. Thunder happens because the air gets superheated and essentially explodes when the lightning discharges, generating a shockwave which you hear as the thunder.

Jehovah is the name of God in the Abrahamic religions (originally just Judaism, but later Christianity and then Islam, plus a variety of other smaller offshoots). The name is written as "יהוה‎" in the original Hebrew, and translated from Hebrew to English as "YHWH" or "Yahweh." "Jehovah" is what you get when the name takes a linguistic detour through Latin—much like "ישוע" ("Yeshua") is "Joshua" when translated directly to English, but becomes "Jesus" when it passes through Latin.

The name of the Jehovah's Witnesses refers to "witnessing" in the sense that you'd call a witness to testify in court, in that they're prepared to present the story of their personal experience as a reason for others to be convinced.

Jehovah is one way of pronouncing the name of the Judeo-Christian god. Most Christian sects don't use that name for God, but that one does.