Acme

I missed that error, but I think you're right about not making a difference inasmuch as you said H. erectus and -our previous discussion notwithstanding- there is evidence of fire use by that species. Wiki says this about H. erectus and fire: Full mention:Homo erectus Brief quote: While there is a measure of doubt on dating and circumstances, I understood your original question and I'm happy that you were satisfied with my answer.

No worries. We can take some measure of pleasure in that your succinct reply here is in agreement with my rather lengthy argument in the sister thread.

Yes; we already had that discussion and Mauricio linked to it in the opening post. >>Early use of fire by hominds

Cops regularly try & put the kibosh on people recording them. A search of "police try to stop cameras" returns many hits. Here's just one. >> Cops vs. cameras: filming cops illegal The homeless have more than enough to put them in conflict with police already, and while your idea seems well-intentioned it is not very practical.

Metallic iron and/or steel is not necessary for firelighting and likely wasn't available in the time frame you have outlined. Firelighting Pyrite is found around the fertile crescent and -as any valuable resource- may have been traded for in areas where it is not found. Pyrite Info & Map The friction method is as likely to have developed from rubbing sticks together as the percussion method developed from striking stones together.

What is the context of your questions Lisa? I mean to say, who were 'they'? Was it a medical setting? What was the group? Why do you assume the weakness was due to blood loss? Couldn't the weakness be due to the alleged drink? Do you have a reference link?

Size, i.e. diameter, is just one measure of the danger. Composition/mass, speed, location of impact, and angle of entry play roles in the impact effects. Lots of links at this site: >> Near Earth Object Project Here's an impact calculator that lets you enter multiple parameters and read the resulting damage: >> Earth Impacts Effects Programs

This looks to me like a thinly veiled attempt to restart the just-closed thread on math being unsafe. Here we go again.

Leaving us separated by a common language perchance? What is missing from the original sentences is a context whereby we may discern the meaning.

When the meaning of 'lets' is 'allow', there is no apostrophe. You would write "Mom, let us ride the train." if speaking to Mom, or "Mom lets us ride the train." if speaking to someone other than Mom. In your original 2 sentences [if speaking to Mom] I would use a semicolon and either would be correct to say. The meanings I think are different in that the first, "Mom; let us ride on the train." is a demand, whereas the second, "Mom; let's ride on the train." is a suggestion. In the latter there is an implication that Mom is riding together with the speaker but no such implication in the former unless it is understood as being an overly formal statement as already mentioned. By now all have missed the train and this lets us off the hook. Let's drop the subject.

Yes. Moreover: source It is the threat to biological diversity that I am on about and in particular the areas that retain native plant biodiversity. Bringing up our crops and/or passing invasives off as just evolution are red herrings. Then too, throwing in the towel makes as much sense as not treating someone who is ill because hey, they're gonna die sooner or later anyway.

No. That is not what I am trying to say . . I am trying to say there are tools or states of minds ,that are best for certain occasions . And I am not even saying this as an absolute rule , but generally , in an exploratory , borderline, boundary of science, blue sky situation , namely 'often in front ' ( not always) , that :- an observation based, hypothesising, even speculating , style :- is the most suitable approach in the first instance. To be too rigorous, too exacting in belief, too inflexible and rigid in the early exploration, could mean ignoring sensitive indications of a lead into new , unknown , regions of discovery. And I am not saying that individuals , including mathematicians are incapable of such an approach . But if they are to enter that frame of mind, there is a need of a " willing suspension of disbelief " for the times they are mentally occupied in discovery exploits. Or to take other style, explorers , more seriously, when they ' blather on ' in Non Mathematical language . ----------------- I hope that makes some form of sense ! Mike The operative term in all you just said is blather, which is more-or-less equivalent to my using the word whine. Both terms invoke an element of annoyance and indeed you have annoyed us and continue to blithely do so. Get over it. It is mathematics that offers the exact natural sciences a certain measure of security which, without mathematics, they could not attain. ~Albert Einstein

You appear to be a skilled artist so be content with that. Just because you can't lift the load does not mean others can't. I don't understand what that 'sticky' means, but I suppose in the end you will keep whining. PS There is an implication in all you have said that mathematicians lack the gestalt you have promoted; nothing could be further from the truth. To quote a most practical man: What science can there be more noble, more excellent, more useful for people, more admirably high and demonstrative, than this of mathematics? ~Benjamin Franklin

Seems to me the crux of the matter is that you don't know enough math to check the work of those skilled in it and so you mistrust it, i.e. don't feel 'safe' with it.

Genocide refers to people, not plants. Likewise you misuse the definition of invasive plants as applied by botanists. All-in-all I find your analysis worthless.

An indicator light is not a 'pilot-light'. You are gonna seriously harm yourself or others and property. I'm done here.

On a resistance heater? I don't think so.

Pilot light?

There may also be an issue with the thermostat.

I don't think you can eliminate the inverter. Certainly not if the heater has a fan. Sounds to me like you're inviting trouble by jury-rigging a setup for which there is already standard equipment.

Are you asking if you can run an AC heater on DC? Anyway, the usual method is to use an inverter to change you DC 12V battery output to AC. From there it's a matter of wattage for both the heater and the inverter output. My experience is that the inverter has to exceed the load in its wattage because the initial surge will trip the inverter safety control. For example, my 800watt inverter won't run my 750watt heater.

No, it's not [necessarily] right. As your geologist friends told you, it all depends on which chunk you are in front of. The cliff is not like a clock, it's like a time card. For the time card the clock is always ticking, but you are not always working. For the cliff, the clock is also always ticking, but layers are not always being deposited (or weathered). . Next time you're at the cliff, get your nose right up to it and take notice of the different thickness of the layers. . I'll be back in a few minutes with a different type of cliff example from my area. OK. So this cliff was once the bottom of a glacial lake. I and my compadres measured the exposed part @ ~30 ft. Such deposits are called varves Unlike your chalk cliff, in a varve each layer is 1 year, where a layer has a thick part and a thin part. During summer when the lake is thawed, dust blows onto the water and sinks and this forms the thick part. In Winter the lake is frozen and the finer organic material sinks & forms the thin part of a layer. Rinse & repeat. While this is very like a clock -and used to that end by geologists- one cannot simply measure the cliff and a section of layering and deduce the overall age, because the layers are not all the same thickness. Here's a nose close look at a 15 year section that I collected. Another interesting thing that shows up in these deposits is embedded stones called erratics. They get there when a stone in Winter falls onto the frozen lake top and slides out, and when the thaw comes drops to the bottom like...well, like a stone in a lake. Here are a couple such erratics. Dating the age of either your cliff or mine requires lab work that looks at the particulars of layers, whether that is embedded plant or animal remains or radiometric dating. Once a single layer in my cliff is dated one can just count layers from that measured to get dates, whereas with your chalk deposits each layer would have to be individually dated. In either case one cannot simply look at the whole and extrapolate its age from its height/thickness. We can of course deduce that the lowest layers in both deposits are the oldest and the upper layers the youngest and this deduction is the basis of geology's law of superposition. PS Here's the exact coordinates for my varve in the Gifford Pinchot National Forest; you can enter them in Gaggle Earth and go have a look. >> 45º56'41" N 122º16'28" W elev. 838ft.

Looking around a bit, I see potassium bitartrate, i.e. cream of tartar, is recommended for cleaning aluminum. If the pan is enameled or bare steel, oven cleaner is the way to go from my personal experience. Wear gloves and eye protection.

Could be, though I've not seen any aluminum broiler pans. The ones I have seen are steel or enameled steel. If it is aluminum, is there a chemical you recommend? If it is aluminum I'd go with a wire wheel on a drill.

Use oven cleaner. It has lye in it, usually either sodium hydroxide (NaOH) or potassium hydroxide (KOH). Let it sit after applying and then add the elbow grease. You may need several applications depending on how bad the gunk is.